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The biological resting state of millet seeds (Panicum virgatum L.) and method of its reduction

Author(s) Дрига В. В., , ,
year 2020 issue Issue number 96. Part 1
pages 193-205 index UDK 633.63: 631. 531.12
DOI 10.31395/2415-8240-2020-96-1-193-205 (Link)
Abstract Goal. The effectiveness of millet seeds scarification, depending on its varietal characteristics was studied. Methods. Laboratory, mathematical and statistical. Results. One of the main limiting factors that constrain the millet widespread introduction in the production is the long biological state of seeds dormancy and, consequently, its low germination. Different methods are used to disrupt the dormancy of seeds, but they are all based on stressful conditions creating for the seeds before germination or during germination. One way of the resting state reducing is scarification - the destruction of its hard-waterproof surface of the shell and its partial removal by mechanical means, which provides free access to water and oxygen to the embryo and, accordingly, increases the intensity of its germination. Our previous research has shown that this method provides a significant improvement in seed quality. To further study the effect of scarification on seed quality, experiments were conducted on the application of this measure depending on varietal characteristics. The seeds of two varieties of rod millet different ploidy and of different maturity groups were scarified: the medium-late Cave-in-Rock variety and the medium-ripe variety Sunburst. The scarification affected on the quality of seeds in different ways, depending on the varietal characteristics and the degree of scarification - the amount of seed coat removed was found. With the scarification of individual batches of seeds of both varieties, germination energy and germination significantly increased, and some even decreased. The significant difference was also found in these indicators depending on the varietal characteristics. The germination energy and similarity of the Cave-in-Rock variety were higher by 10 and 11 % in the control, and for scarification — by 13 and 12 % compared to the Sunburst variety. The influence of the factor "scarification" on the germination energy and germination was insignificant and amounted to 2 and 6 %, respectively, the influence of the factor "variety" was significant and amounted to 89 %. There are average feedbacks between the degree of scarification of Cave-in-Rock seeds and germination energy and between the degree of scarification and germination, with a correlation coefficient of -0.54 and -0.52, respectively. Similar dependences are found in the Sunburst variety, but the correlation is weak. Conclusions. Not all batches of seeds respond equally to this method of quality improvement. With the scarification of individual batches of seeds of both varieties, germination energy and germination significantly increased, and some even decreased. Scarification of seeds provides a significant increase on its quality and this method is possible for implementation in production but it does not solve the problem of reducing the biological dormancy of seeds.
Key words germination, germination energy, scarification regimes, varietal characteristics, seed coat
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