Response and resilience of different tolerance/susceptibility maize inbred lines to high temperature stress

doi:10.14088/j.cnki.issn0439-8114.2022.22.001

Abstract

Abstract: In order to explore the response of different genotypes of maize inbred lines to high temperature stress at the seedling stage and the difference of their resilience, the artificial climate chamber was used to carry out the warming test. The heat-resistant inbred line 13HF1849 and the heat-sensitive inbred line 14HF1406 screened by the high temperature test were used as materials to study the response and recovery of plant traits, gas exchange parameters and leaf stomatal characteristics of maize seedlings to high temperature stress. The results showed that compared with the control, high temperature stress significantly affected the leaf area, SPAD, plant height and leaf emergence rate of sensitive inbred line. In addition, net photosynthetic rate （Pn）, transpiration rate （Tr） and potential water use efficiency （iWUE） decreased by 25, 17 and 2 percent respectively. On the contrary, the plant height and leaf area of heat resistant inbred line were less affected by high temperature stress, and Pn, Tr and iWUE increased by 49, 12 and 25 percent, respectively. The stomatal density （SD）, stomatal area （SA） and stomatal width （SW） of the two inbred lines increased significantly under high temperature, and the heat-resistant inbred line was significantly higher than the sensitive inbred line. In addition, high temperature increased the stomatal conductance （Gs） of heat resistant inbred line and decreased that of sensitive inbred line. Correlation analysis showed that Pn and iWUE of the two inbred lines under high temperature stress were positively correlated with Gs and SW. After normal temperature recovery, the Pn, SD, SW and SA of the two inbred lines were lower than those of the control group, but the heat-resistant inbred lines were higher than the heat-sensitive inbred lines. The Tr, iWUE and Gs of heat resistant inbred lines were higher than those of the control group. Therefore, compared with the sensitive inbred line, the gas exchange performance of heat resistant inbred line was stronger at high temperature and had good recovery, which was related to the large stomatal density, stomatal conductivity and stomatal width induced by high temperature.

Key words: maize, high temperature stress, gas exchange, stomatal characteristics

CLC Number:

S513

XIE Yi, NI Yan-lin, ZHU Hang, ZHU Ye-qing, ZHANG Yan, ZOU Hua-wen, ZHANG Bing-lin. Response and resilience of different tolerance/susceptibility maize inbred lines to high temperature stress[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(22): 5-13.

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