4种禾本科牧草种子生产特性的研究

Studies on seed production performance of four gramineous plants

试验对4种禾本科牧草的种子生产特性进行了研究。测定了4种禾本科牧草蜡熟期种子在不同贮存阶段的种子质量,计算了种子产量构成因子、潜在种子产量和实际种子产量。种子在不同贮存阶段的发芽率、发芽指数和活力指数是逐步提高的过程,表明这4种牧草种子存在后熟特性。通过统计种子产量构成因子,计算出4种牧草的潜在种子产量均很高,但冰草和披碱草的实际种子产量并不高,主要是小花败育较多,结实率低,种子落粒性强以及植株倒伏等因素造成的。薄冰草和中间偃麦草的实际种子产量相对较高。

Studies were carried on the seed production performance of four gramineous plants. The physiological quality of these seed are assessed in different storage stages of matured seeds. Seed yield components were analyzed. Potential seeds yields were estimated based on seed yield components and actual seed yields were evaluated. The seed germination capacity, germination index (GI) and vigor index (VI) of mature seeds progressively raise along with the storage period, which show that the four plants have after-ripening characters. The potential seed yields of the four plants are all high by counting the values of seed yield components. However the harvested seed yields of Agropyron desertorum and Elymus lanceolantus are not very high because of the factors of low seed setting percentage, seed dropping character and plant lodge, etc. The harvested seed yield of Elytrigia intermedia and Thinopyrum ponticum are relatively higher.