Welcome to Acta Prataculturae Sinica ! Today is Share:

Acta Prataculturae Sinica ›› 2019, Vol. 28 ›› Issue (4): 81-94.DOI: 10.11686/cyxb2018225

• Orignal Article • Previous Articles     Next Articles

Effect of exogenous ABA on the endogenous hormone levels and physiology of chilling resistance in the leaf sheath of rice at the flowering stage under low temperature stress

XIANG Hong-tao1, 2, QI De-qiang3, LI Wan2, ZHENG Dian-feng3, WANG Yue-xi2, WANG Tong-tong2, WANG Li-zhi2, ZENG Xian-nan2, YANG Chun-jie2, ZHOU Hang3, ZHAO Hai-dong3   

  1. 1.Heilongjiang Academy of Agricultural Sciences Postdoctoral Programme, Harbin 150086, China;
    2.Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China;
    3.College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing 163319, China
  • Received:2018-04-11 Revised:2018-06-25 Online:2019-04-20 Published:2019-04-20

Abstract: This research investigated the effect of exogenous abscisic acid (ABA) applied to the leaf sheath of rice at low temperature, on endogenous hormone levels, and on a cold hardiness physiology index of two rice varieties. Potted plants of rice varieties, LD5 (cold tolerant) and LJ11 (cold sensitive) were exposed to low temperature (15 ℃; 1, 2, 3, 4, or 5 d) in a climate chamber, at the flowering stage. Low temperature at flowering significantly decreased pollen vigor and seed set, and these effects were particularly serious in the cold sensitive varieties. The exogenous ABA effectively inhibited the decrease of the seed setting rate. Low temperature increased the levels of malondialdehyde (MDA), soluble sugar, soluble protein, and proline, and the relative conductivity of the leaf sheath, and also led to changes in the activities of superoxide dismutase, peroxidase and catalase. Exogenous ABA reduced the level of MDA and the relative conductivity, and promoted an increase in soluble sugar, soluble protein and proline levels, and promoted improvements in protective enzyme activity. This study confirmed that exogenous ABA improves the cold resistance of rice. Enhancement of low temperature resistance in rice will be very significant in facilitating increased rice production in the colder northeast east regions of China.

Key words: low temperature, exogenous ABA, rice, flowering stage, endogenous hormone, chilling resistance