高羊茅种子发育过程中的生理生化变化

供试高羊茅法恩和赛福瑞两个品种的种子在发育过程中含水量不断下降，由最初的６０－７０％降至最终的１３％左右，种子的鲜重先于干重达到最高值，然后逐渐下降，而干物质重在含水量迅速下降时增加缓慢。法恩和赛福瑞高羊茅种子在含水量分别降至４５．３和４４．１％后进入生理成熟期。淀粉与可溶性糖含量则相反的变化，淀粉在种子发育初期积累迅速，ＡＴＰ和ＴＴＣ含量均达到最高值。

Physiological and Biochemical Changes in Tall Fescue Seed Development

The moisture content decreased from initial 60 ~ 70% to final 13% during theseed development of two varieties of tall fescue, Fawn and Safari. Seed fresh weight reached thepeak before the seed dry weight did and then fell, but dry weight increased slowly during the rapiddecline of seed water. The seed physfofogical maturity of Fawn and Safari occourred when themoisture content was 45. 3 % and 44. 1 % respectively. During the early stage of development ofFawn and Safari, starch accumulation increased rapidly, the increasing of starch content was ac-companied by the decline of soluble sugar. The content of ATP and reached the perakwithin 13 days of anthesis. With the loss of water and seed drying, souble sugar maintained 4 -5 % and the content of ATP and TTC decreased, but starch content maintained constant.