摘要
超量施氮或氮、磷、钾肥配比不适的小麦植株,于灌浆后期遇到“V”字型气温的剧烈变化,往往出现突然青枯死亡。青枯是一种生理性反应,虽然发生在灌浆后期,但在灌浆中期体内代谢与正常落黄植株相比,已具有明显的差异。具体表现是含氮水平高,某些含氮化合物转运速度慢,抗逆力下降,外部形态表现贪青。在灌浆后期遇到“V”字型气温后,体内氨基酸、游离氨、腐胺等氮代谢中间产物超量积累.腐胺超量对植物具有强烈毒性,能导致小麦植株青枯骤死。小麦青枯危害程度与旗叶腐胺积累量呈正相关,千粒重与腐胺含量呈高度负相关(r=-0.9189)。
Wheat plants with excessive N or disproportionate N/P ratio usually wilt suddenly when met with the“V”type temperature in late filling period.This phenomenonis the result of physiological reaction.Although this happens usually in the late fillingperiod,significant differences in mechanism can be detected in the middle fillingperiod.These plants showed a markedly higher levels of N,slower transportationrate of some N-compound,lower tolerance to stress and longer duration of physiological greenness.Moreover,the intermediate products of N-metabolism process,such as amino acid,NH_3 and putrescine,accumulated excessively in late fillingperiod.Excessive putrescine is very poisonous to plants and can lead to the physiological wilt.The degree of damage caused by wilt was positively correlated with theputrescine content in the flag leaf,and 1,000-kernel weight was negatively correlatedwith the putrescine content.
出处
《作物学报》
CAS
CSCD
北大核心
1990年第3期228-234,共7页
Acta Agronomica Sinica
关键词
小麦
青枯
腐胺
Wheat
Prolonged greenness wilt
Putrescine
