• 研究报告 •

### 宁夏灌区春小麦形态结构及干物质分配对不同时期干旱胁迫的响应

1. 1南京信息工程大学应用气象学院， 南京 210044；2中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室，银川 750002；3宁夏气象科学研究所， 银川 750002）
• 出版日期:2019-07-10 发布日期:2019-07-10

### Responses of morphological structure and dry matter allocation of spring wheat to drought stress at different developmental stages in the irrigation district of Ningxia.

WANG Chen1, WANG Lian-xi1*, MA Guo-fei2,3, ZHANG Xiao-yu2,3, LI Qi1

1. (1School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, Yinchuan 750002, China; 3Ningxia Institute of Meteorological Science, Yinchuan 750002, China).
• Online:2019-07-10 Published:2019-07-10

Abstract: We examined the responses of morphological structure and dry matter distribution of spring wheat to drought stress in different developmental periods in 2018, with the mainly popularized variety of Yongchun No. 4 in Ningxia as the experimental material. There were six different irrigation treatments. The results showed that the treatment of no irrigation at all growth stages shortened the whole growth stage by 11 days. Drought in the tillering and jointing stages reduced lower stem segments of spring wheat spike, leaf area, and plant height, and advanced leaf yellowing. Water shortage at tillering stage had the strongest effect on leaf area, while water shortage at jointing stage had the most effect on plant height. Drought affected the accumulation and distribution of dry matter in spring wheat. When spring wheat was under drought stress at the tillering stage, the proportion of leaves in the total dry matter decreased by 6.6%, and the proportion of leaf sheath in the total dry matter increased by 9.0%. Compared with the control, when the spring wheat was under no irrigation at all growth stages, the spike length, spike number, spike grain number and thousand kernel weight were reduced by 5.9%, 43.4%, 9.6% and 7.6% respectively. Mild drought at tillering stage significantly decreased the wheat spike number, but increased the number of grains per spike and the thousand kernel weight by 9.2% and 4.7%. The drought during flowering to filling stage had the greatest effect on the thousand kernel weight, with a decrease of 17.4%.