采用盆栽控水方法,研究不同生育时期干旱胁迫对谷子物候期、株高、叶片数、顶叶叶面积、穗长、根轮数等农艺性状及产量的影响.结果表明,干旱延迟谷子物候期的出现；拔节期干旱对谷子株高的影响最大；干旱不会引起谷子总叶片数的改变,但对叶片发生时间有一定影响；拔节期干旱和孕穗期干旱使谷子顶叶叶面积减小；干旱抑制谷子根系的生长,但复水后生长迅速恢复.拔节期干旱对谷子农艺性状造成的影响最严重、最持久,干旱胁迫使谷子的产量降低,尤以灌浆期干旱对产量影响最显著.%Using movable rain shelter shed to keep off precipitation, the pot experiment was carried out to study effects of drought stress at different periods on agronomic traits of millet. Phonological periods, plant height, the leaf number,flag leaf's area, spike length, and the roots sheaves number were investigated, Yields were measured after harvest. The results showed that phonological periods were delayed under drought stress. The drought treatment at jointing stage had the worst effects on plant height. Water stress could affect the leaves' growth,but it hadn't affected the whole leaf number at all. Flag leaf's area under jointing and earing stage was smaller than other stages. The roots' growth was restrained by drought stress, it could recovered rapidly after restoring water, however. Drought stress at jointing stage had the biggest effect on agronomic traits. Grain yield could be lowered by drought stress especially the stress at pustulation period.
展开▼
