Study of peculiarities of morphology and germination of seeds of Scabiosa ochroleuca from the Central Kazakhstan

The study of the biology and morphology of seed germination of medicinal plants is an important aspect of species introduction. This article investigated the features of the biology of germination and seed germination of a perspective medicinal plant Scabiosa ochroleuca depending on various factors. It is determined that seeds of some geographical origin differ in size and weight, the morphology of seedlings, which is explained by the difference in soil and climatic conditions. The best values of germination (90.5 %) and germination energy (80.3 %) of seeds were recorded in large samples collected in the Buiratau mountains, the minimum — in small seeds collected in the Karkaraly mountains (germination 14.0 %, germination energy 8.5 %). The maximum morphological parameters of seedlings, such as the length of the root, the length of the hypocotyl, the length and width of the cotyledon leaf, are revealed in seeds from the Karkaraly mountains; the minimum — from the vicinity of the village Karagaily. This aspect indicates the need to select seeds for introduction from certain habitats and to separate them before sowing. Stages of germination of seed material of this medicinal plant are defined, including the following: swelling of seeds, tilting, appearance of root, appearance and bending of hypocotyl, removal of cotyledon leaves, and deployment of cotyledon leaves. Dynamics of seeds germination during storage (from freshly harvested seeds up to 3 years) was determined, positive influence of stratification during 3 months was revealed to increase seed germination and germination energy. According to the results of the studies, it was determined that the seeds of Scabiosa ochroleuca are characterized by the lack of drainage during wetting, the terrestrial type of germination, shallow physiological rest, by the type of germination are assigned to the group of seeds with accelerated germination.

Introduction

Plants from different habitats form different potentials of productivity, morphological structures and variability according to some characteristics. So, depending on the growing conditions, plants can develop organs of various sizes, the intensity of physiological processes changes, which is reflected in the size and performance of seeds [1–3]. In favorable conditions of growing, seeds are formed large, full-fledged and with a well-developed embryo and a supply of nutrients.

Identification of the influence of factors on the development and germination indicators of seeds is important for issues of plant introduction, as well as factors that can increase the germination of seed material.

Introduction into the culture of medicinal plants has an important practical interest for the sustainable production of vegetative raw materials. About 6500 species of plants grow in Kazakhstan, along with cultivated taxa. Of these compositions, 85 % belong to herbaceous plants, 730 species are endemic, of which 175 species grow in steppe regions, 250 species of desert and semi-desert zones, 600 endangered species, more than 1000 species are used in official and folk medicine [4, 5]. One perspective species is Scabiosa ochroleuca L. (Dipsacaceae family), the aboveground part of which is used in folk medicine for stomach diseases, female and ocular diseases, for the excretion of warts, wound healing, in scabies, skin rash, hemorrhoids, calluses, snake bites, anti-opaque Extracts from this plant have pronounced antimicrobial and antioxidant activity [9, 10].

Extracts from this plant have pronounced antimicrobial and antioxidant activity [9, 10].

In Kazakhstan there is information about natural resources of this species [11], however, no introduction work was carried out.

The purpose of this work is to study the features of the morphological structure of Scabiosa ochroleuca seeds of various geographical origin; and determination of their biology of germination.

Objects and methodology

The object of the study was thseed material of Scabiosa ochroleuca, collectein Karkaraly Mountains and surrounding of village Karagaily (Karkaraly district, Karaganda region), Buiratau Mountains (Osakarov district, Karaganda region). Research was carried out in 2018–2020 on the basis othe Research Center of Biotechnology and Eco-Monitoring of E.A. Buketov Karaganda State University.

The seed material was separated by size and weight (small, medium and large), the length, width and weight 1000 pieces were measured, and after germinated. To assess the germination of seeds, they were germinated 50 pieces in three repetitions on humidified 2-layer filter paper in Petrdishes at a temperature +24 °C in the climate chamber. Seeds after harvesting were study in fresh as well aafter stratification from 1 to 3 months. Stratification was performed in the refrigerator. To determine viabilitdepending on period of storage, seed germination and germination energy for 3 years were evaluated.

The study of germination and germination energy of seeds was carried out according to the methodological instructions of M.S. Zorina and S.P. Kabanov [12].

Morphology of seeds and seedlings was examined on a Levenguk USB-microscope at an increase of 40–80 times [13]. For seedlings, the following parameters were evaluated: total height of plants, length of the hypocotyls, length and width of the cotyledon leaves; length of the root system. Thweight of the seedlings according to the test versions was estimated by weighing on the analytical weights in 10-fold repetition on dry weight [14].

The study of the biology of seed germination was carried out taking into account the recommendations of K.E. Ovcharov, E.G. Kizilova [15], M.K. Firsova [16], P. Wellington [17].

Statistical processing of the results was carried out according to the method of N.L. Udolskaya [18] using the Microsoft Excel 2010 software package.

Results and discussion

The fruit Scabiosa ochroleuca is an achene with a serrated-wavy film crown, light brown, singleseeded, with an oily endosperm, pericarpium 8-sided deep-notched, cone-shaped. The length is 1.5–2 cm; the width is 0.4–0.6 cm. The shape of the seed is kidney-shaped, oval or rounded (Fig. 1).

The biology of seed germination of Scabiosa ochroleuca has been studied. During soaking, the seeds swelled, increasing in size by 1.2–1.3 times; no sliming was observed. The absence of dehumidification indicates plant growth under mesophytconditions [19].

Seed deposition in laboratory conditions occurred on 2–3 days. At the samtime, pericarpium was opened and the germ root was the first to appear from the achene. Its length was 68 mm; diameter 0.4–0.5 mm. Root hairs are weakly visible on the end of the root. After (on day 4–5), a milk-white hypocotyl appeared, the rest was still hidden in the seed. On day 6–8, the hypocotyl was drawn, forming a bend (Fig. 2), then straightened, carrying the cotyledons outside. Hypocotyl is white, elastic, 10–1mm length and 0.5–0.6 mm in diameter. Cotyledon leaves came to the surface folded, after which they opened.

 

The plate of the cotyledon leaf was narrow-lanceolate, 6–8 mm long, 4–5 mwide, color was light green, the surface is smooth, the apex is weakly notched. The height of the seedling by this period was 1.8–2 cm, the length of the root was 2.4–2.6 cm; root hairs became noticeable.

Thus, the seeds of Scabiosa ochroleuca are characterized by above-ground typof germination, characterized by a shallow physiological rest. By the type of germination [20, 21] are assigned to the group of seeds with accelerated germination.

Morphological analysis showed that the seed material of different geographical origins differed in size and weight (Table 1).

Origin of seeds

Average length of seed, cm

Average width of seed, cm

Weight 1000 pieces, g

Number of seeds per one florescence, pieces

Buiratau Mountains

2.6±0.2

1.5±0.06

0.16±0.01

296±12

Surrounding of village

Karagaily

2.7±0.1

1.8±0.04

0.21±0.01

315±25

Karkaraly Mountains

3.4±0.4

1.7±0.05

0.32±0.02

345±31

Table 1 Morphological parameters of seeds of Scabiosa ochroleuca depending from origin

As can be seen from the givedata, the maximum length had seeds from the Karkaraly Mountains — 3.4 cm; by thickness — the maximum values were obtained for seeds from thsurrounding of village Karagaily — 1.8 cm; and the maximum weight of seeds is recorded for seeds from the Karkaraly Mountains.

However, the size and weight of the seeds do not reflect quality indicators, so we determined germination and energy of germination. It was determined that the best indicators were noted Scabiosa ochroleuca

seeds collected in the Buiratau Mountains (Table 2), the second position in germination was taken by seeds from the surrounding of village Karagaily; seeds from Karkaraly Mountains were on the third position.

Table 2 Indicators of seed germination and germination energy of Scabiosa ochroleuca, depending on the places of origin

Origin of seeds

Seed germination, %

Energy of germination, %

Buiratau Mountains

64.5±2.6

50.4±0.8

Surrounding of village Karagaily

61.0±2.8

52.9±1.8

Karkaraly Mountains

50.1±2.1

41.0±0.9

It is worth noting that the size and weight of the seeds do not correlate with the germination data. It turns out that seeds from the Buiratau Mountains with a minimum weight of seeds gave maximum germination indicators, while the largest and heaviest seeds turned out to be the least germinating.

Thus, the seed material of Scabiosa ochroleuca differs in size and weight depending on the place of growth. So, the largest seeds are formed in Karkaraly Mountains, the smallest — in Buiratau Mountains. This aspect can be explained by the fact that in Karkaraly Mountains more mesophytic conditions are observed (more precipitation), which leads to a good development of plant morphology. In Buiratau Mountains, the conditions are more xerophytic, so the size of the seeds is lower. However, data on seed germination and energy of germination turned out to be higher in Buiratau Mountains, which is probably due to the fact that the formation of seeds depends on solar activity, which is higher at this point.

In the second stage of research, the effect of seed sizes from different collection points on germination indicators was studied. All samples from collection points were divided into 3 fractions (large, medium and small), for which germination peculiarities were separately estimated. The results showed that large seeds had maximum values for parameters of germination (Table 3).

Table 3 Germination and energy of germination of seeds of Scabiosa ochroleuca depending from size

Origin of seeds

Fraction of seeds

Seed germination, %

Energy of germination, %

 

Large

90.5±3.5

80.3±3.9

Buiratau Mountains

Medium

62.4±2.8

51.2±2.5

 

Small

26.4±0.5

20.1±0.7

Surrounding of village

Large Medium

60.2±3.0

61.4±3.4

50.1±1.8

52.0±1.6

Karagaily

Small

28.5±0.8

12.4±0.6

 

Large

46.2±1.1

38.0±0.8

Karkaraly Mountains

Medium

45.5±1.0

40.1±1.1

 

Small

14.0±0.5

8.5±0.3

Maximum indicators of germination were recorded for large seeds from Buiratau Mountains — 90.5 % with energy of germination 80.3 %; minimum indicators — for small seeds from Karkaraly Mountains — 14.0 % and 8.5 % respectively. It has been determined that for Scabiosa ochroleuca seeds, in order to increase the efficiency of storage of seeds in culture, it is advisable to collect the initial material at certain points and to separate the seeds in favor of larger ones.

We analyzed the state of Scabiosa ochroleuca seedlings, obtained from seeds of different size and origin. There is a positive relationship between seed size and seedling size (Table 4).

At all collection points, it was found that the most made seedlings are obtained from large seeds, while smaller seedlings are obtained from small seeds. The obtained results once again confirm that the use of large seeds allows obtaining larger and more developed seedlings. It is worth noting that the maximum difference between seedlings from seeds of different sizes is observed in Buiratau Mountains, the minimum — in Karkaraly Mountains.

Analysis of the germination of Scabiosa ochroleuca, depending on period of storage, showed that the seed material gradually loses its germination. So, freshly harvested seeds 58.8 %, after 3 months of storage — slightly increased to 62.4 %. This aspect is explained by seed ripening [14, 15, 19, 20]. After

6 months, germination decreased to 55.2 %, a year later — to 40.3 %, after 1.5 years — to 36.8 %, after 3 years — to 18.2 % (Fig. 3).

Origin of seeds

Fraction of seeds

Length of root, cm

Length of hypocotyls, mm

Length of cotyledon leaves, mm

Width of cotyledon leaves, mm

Buiratau Mountains

Large

5.4±0.2

5.5±0.4

7.2±0.5

3.5±0.2

 

Medium

3.1±0.1

2.8±0.1

5.6±0.4

3.0±0.2

 

Small

2.5±0.05

2.4±0.1

4.9±0.4

2.2±0.1

Surrounding of village

Large

5.0±0.4

4.8±0.4

6.5±0.4

3.8±0.4

Karagaily

Medium

4.4±0.2

4.6±0.3

5.5±0.3

3.5±0.2

 

Small

4.2±0.2

4.5±0.2

1.5±0.3

1.0±0.05

Karkaraly Mountains

Large

6.2±0.3

5.5±0.2

5.6±0.2

4.0±0.1

 

Medium

6.4±0.4

4.7±0.2

6.0±0.3

3.8±0.1

 

Small

3.1±0.1

2.6±0.1

4.6±0.2

3.0±0.1

Table 4 Morphological parameters of Scabiosa ochroleuca seedlings depending on the size of seeds and origin

Thus, over the course of 3 years, we have seen a significant decrease in germination rates, which requires the development of methods for increasing it. We tested cold stratification.

Stratification was carried out in a freezer with seeds from Buiratau Mountains after 1 year of storage for 1 to 3 months. The initial germination was 40.3 %, and the germination energy was 37.5 %. During stratification, there is an increase in germination and germination energy indicators (Table 5).

Methods of treatment

Seed germination, %

Exceeding control, %

Energy of germination, %

Exceeding control, %

Control

40.3±0.8

-

37.5±0.6

-

Stratification, 1 month

55.2±2.0

+4.9

47.4±0.9

+9.9

Stratification, 2 months

58.8±2.8

+18.5

56.3±2.2

+18.8

Stratification, 3 months

64.2±3.4

+23.9

58.7±2.6

+21.2

Table 5 Germination and energy of germination of seeds of Scabiosa ochroleuca after cold stratification

It is worth noting that after the 1st month of storage, the germination of Scabiosa ochroleuca seeds increased by 4.9 % and germination energy by 9.9 %; after 2 months of storage by 18.5 and 18.8 %, respectively; and after 3 months of storage by 23.9 and 21.2 %, respectively. According to the results of the experiment, the best results were obtained against the background of a 3-month stratification period.

Серия «Биология. Медицина. География». № 3(99)/2020

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Conclusion

Thus, it was determined that the seeds of Scabiosa ochroleuca have different morphological indicators, which is explained by the difference in environmental conditions of plant growth. The largest and heaviest seeds are noted in plants growing in Karkaraly Mountains with the most favorable soil and climatic conditions; the smallest are for individuals from Buiratau Mountains with the most arid conditions.

It is noted that seeds of Scabiosa ochroleuca of different size and weight vary in terms of germination and size of seedlings. The best values of germination (90.5 %) and germination energy (80.3 %) of seeds were recorded in large samples collected in Buiratau Mountains; the minimum — in small seeds collected in Karkaraly Mountains (germination 14.0 %, germination energy 8.5 %). There is a more significant correlation between seed size and germination. The maximum morphological parameters of seedlings, such as the length of the root, the length of the hypocotyl, the length and width of cotyledon leaves, are revealed in seeds from Karkaraly Mountains; the minimum — from surrounding of the village Karagaily. This aspect indicates the need to select seeds for introduction from certain habitats and to separate them before sowing.

Stages of germination of seed material of this medicinal plant are defined, including the following: swelling of seeds, tilting, appearance of root, appearance and bending of hypocotyl, removal of cotyledon leaves, deployment of cotyledon leaves. The type of germination is above ground.

During storage, there is a gradual decrease in germination and germination energy from 58.8 % for freshly harvested seeds to 18.2 % after 3 years of storage. It was determined that physical methods of treating seeds positively affect the increase in germination and germination energy of Scabiosa ochroleuca. The best results were obtained with cold stratification for 3 months (germination 64.2 %, germination energy 58.7 %). Seeds are characterized by a shallow physiological rest, which is easily overcome by stratification, by the type of germination — to a group of seeds with accelerated germination.

Obtained results can be used for formation of seed bank of medicinal plants and introduction of Scabiosa into culture.

The research was carried out within the framework of internal grant of E.A. Karaganda State University № 218-B-19 «Cryopreservation of vegetative and animal biological materials for development algorithm of storage of viability and creation of bank of frozen samples».

 

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Year: 2020
City: Karaganda
Category: Biology