|Table of Contents|

Effects of Different Drought Tolerant Soybean Roots on Photosynthesis of Leaves Based on Grafting Technology(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2020年05期
Page:
751-757
Research Field:
Publishing date:

Info

Title:
Effects of Different Drought Tolerant Soybean Roots on Photosynthesis of Leaves Based on Grafting Technology
Author(s):
LI Sheng-you;  SUN Xu-gang;  WANG Chang-ling; CAO Yong-qiang
(Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang 100161, China)
Keywords:
Soybean;  Grafting;  Root;  Drought resistance;  Photosynthetic capacity
PACS:
-
DOI:
10.11861/j.issn.1000-9841.2020.05.0751
Abstract:
In order to determine the physiological characteristics of different drought-tolerant types of roots and their effects on photosynthetic traits of leaves, so as to provide theoretical basis for soybean root improvement and drought-resistant breeding, this study used drought-sensitive cultivar Liaodou 21 as scion to graft with 22 cultivars rootstocks to evaluate the contribution of roots to drought resistance of 22 soybean cultivars released in Liaoning province. Well-watered (80% field water holding capacity) and drought stress (50% field water holding capacity) were conducted during podding stage in pot-culture experiments. Root physiological traits were determined at 15 d after drought stress, and the drought resistance membership function values of each grafted plant were calculated according to the yield traits at maturity. The results showed that the drought resistance membership function values of different grafts varied from 0.23 to 0.84, and 22 genotypes of rootstocks were divided into 6 drought-sensitive types, 10 intermediate types and 6 drought-resistant types by cluster analysis. There was no significant difference in root bleeding sap mass and root activity among rootstocks under well-watered conditions, but under drought stress, the results showed that, drought-resistant type>intermediate type>drought-sensitive type. Under drought stress, the plants grafted onto drought-sensitive rootstocks showed larger decreases in the relative water content, photosynthetic rate, stomatal conductance and transpiration rate, while these grafted onto drought-resistant rootstocks remained relatively high relative water content, photosynthetic rate, stomatal conductance and transpiration rate. Therefore, the drought-tolerant root system has strong physiological activity under drought, which could improve the drought resistance of soybean plants.

References:

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Last Update: 2020-10-21