Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2018, Vol. 34 ›› Issue (9): 8-14.doi: 10.11924/j.issn.1000-6850.casb17030018

Special Issue: 生物技术 小麦

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Winter Wheat‘Dongnongdongmai 1’: Effects of Exogenous SA and ABA on Physiological Characteristics Before and After Overwintering

  

  • Received:2017-03-03 Revised:2018-03-14 Accepted:2017-03-25 Online:2018-03-21 Published:2018-03-21

Abstract: The paper aims to investigate the effects of exogenous SA and ABA on the cold tolerance and regrowth rate of winter wheat‘Dongnongdongmai 1’. Samples were treated with SA, ABA and a mixture of (ABA+SA) and distilled water as a blank control at the beginning of three-true leaf period; we analyzed morphological index, chlorophyll fluorescence characteristics, physiological and biochemical indicators and regrowth rate of wheat under 5℃, 0℃, -10℃, -25℃. The results showed that: spraying (ABA+SA) could increase the chlorophyll content at different temperatures and effectively increase the values ofFv /Fm , ΦPSII and q P, but decrease theNPQ ; with the decrease of temperature, the relative electrical conductivity, MDA content of‘DN1’increased; compared with the control, SA, ABA and (ABA+SA) could decrease the relative electric conductivity, MDA content, and increase the content of soluble sugar and soluble protein, and at -10℃, (ABA+ SA) group treatment was more significant than other treatment groups; at 0℃ , spraying (ABA + SA) could effectively increase root length and the dry weight of plant; spraying ABA alone and spraying (ABA+SA) could effectively improve the‘DN1’regrowth rate, and the regrowth rate of (ABA + SA) treatment was higher. Therefore, spraying (ABA + SA) treatment had better effect on improving cold resistance and reviving rate of winter wheat.

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