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《Acta Agronomica Sinica》 1990-03
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Studies on the Mechanism of Physiological Wilt of Wheat Plant in Late Filling Period

Jin Xianchun Xu Weisheng Liu Anfu (Wheat Research Institute,Henan Academy of Agricultural Sciences)  
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.
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