Journal of Food, Agriculture and Environment

Endogenous hormone in response to molybdenum in winter wheat roots under low temperature stress

Author(s):

Xuecheng Sun ^{1, 2}, Chengxiao Hu ^{1, 2}, Qiling Tan ², Jinshan Liu ², Hongen Liu ²

Recieved Date: 2010-07-22, Accepted Date: 2010-11-03

Abstract:

Molybdenum (Mo) is an essential element for higher plants. It has been shown that application of Mo enhances the cold resistance of winter wheat. In order to improve our understanding of the mechanisms of enhanced cold resistance arising from Mo application in winter wheat, we investigate the effects of molybdenum on endogenous hormone in roots of winter wheat (Mo efficient cv. 97003 and Mo inefficient cv. 97014) under low temperature stress. The results showed that Mo application increased the aldehyde oxidase (AO) activities, the contents of abscisic acid (ABA) and indole-3-acetic acid (IAA) in winter wheat roots during 6 days of low temperature stress. However, no significant difference in the contents of gibberellin (GA₃) and zeatin (ZT) was observed between -Mo and +Mo treatments at 0 and 2 d of low temperature stress, whereas the contents of GA₃ decreased and ZT increased significantly in +Mo treatments until 4 days of low temperature stress. These results indicated that the response of ABA and IAA to Mo deficiency was prior to that of GA₃ and ZT under low temperature stress. The greater effect of Mo on the ABA and IAA may be due to the fact that Mo can directly regulate ABA and IAA biosynthesis through AO. Mo-deficiency induced the drastic decrease of the ABA/GA₃ in winter wheat under low temperature stress. Similarities and differences between the Mo-efficient and Mo-inefficient wheat cultivars in response to Mo under cold stress are also discussed.

Keywords:

Molybdenum, endogenous hormone, low temperature stress, aldehyde oxidase

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Agriculture
Pages: 597-601

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