Acta Agriculturae Boreali-Sinica ›› 2024, Vol. 39 ›› Issue (3): 104-113. doi: 10.7668/hbnxb.20194655

Special Issue: Hot Article Cultivation & Physiology

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Physiological Response Mechanism of Rye to Low Temperature During Cold Hardening and Rejuvenation Period

YANG Chaowei, SUN Weihong, REN Wei, WANG Dan, AN Mingzhu, GENG Feilong, WANG Xianguo   

  1. College of Grassland Science and Technology,China Agricultural University,Beijing 100193,China
  • Received:2023-12-10 Published:2024-06-28

Abstract:

In order to reveal the physiological mechanism of winter rye in response to low temperature stress,the physiological changes of osmoregulatory substances and antioxidant enzyme activity in the leaves and tillering nodes of Wintergraze 70 and White BK-1 were compared during the cold hardening and rejuvenation periods.The results showed that during the cold hardening period,rye mainly improved its cold resistance by accumulating osmoregulatory substances in leaves and tillering nodes.During this period,the semi lethal temperature gradually decreased,and the semi lethal temperature of White BK-1 reached -9.93 ℃,which was 1.95 ℃ lower than Wintergraze 70 while the soil freezing.The increase of soluble sugar and soluble protein contents in the leaves and tillering nodes of White BK-1 was greater than those of Wintergraze 70,which meant these physiological pathways played an important role in improving the tolerance of White BK-1 to low temperatures in winter.Research on the rejuvenation period found that with the extension of low temperature stress time,the content of malondialdehyde first increased and then decreased.Rye resisted the low temperature of rejuvenation period by increasing the content of osmoregulatory substances,improving the activity of antioxidant enzymes in leaves and regulating the activity of antioxidant enzymes in tillering nodes.White BK-1 suffered less damage under the low temperature stress during rejuvenation period,and its malondialdehyde content was lower than Wintergraze 70 after recovery.In addition,after recovery,two varieties of rye accumulated higher contents of proline and soluble protein in the tillering nodes,which providing sufficient nutrients for growth and development after rejuvenation.

Key words: Rye, Cold hardening, Rejuvenation, Low temperature physiology

Cite this article

YANG Chaowei, SUN Weihong, REN Wei, WANG Dan, AN Mingzhu, GENG Feilong, WANG Xianguo. Physiological Response Mechanism of Rye to Low Temperature During Cold Hardening and Rejuvenation Period[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(3): 104-113. doi: 10.7668/hbnxb.20194655.

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