Evaluation of Drought Tolerance Based on Stomatal Characters and Selection of Germplasm Resources from Xanthoceras sorbifolia

doi:10.7525/j.issn.1673-5102.2021.06.014

Abstract

Abstract:

In order to study the differences in the leaf stomata characteristics of yellowhorn（Xanthoceras sorbifolium） with different germplasm resources and to understand the physiological and ecological response of yellowhorn leave stomata structure to drought stress， We used 108 yellowhorn trees from Erdos City， Inner Mongolia Autonomous Region， China as the research object. The 12 indicators including stomatal length， length of stomatal gap long axial， stomatal width， stomatal density， stomatal area index and so on were measured. We used the principal component analysis（PCA）， subordinate function values and cluster analysis to identify the drought resistance， and screen out germplasm resources which were suitable for planting in arid areas. This study can provide a reference for the cultivation of the yellowhorn in arid and semi-arid areas in China. The results showed that stomatal area was significantly correlated with stomatal length， long axial length of stomata， stomatal width， stomatal perimeter， stomatal opening perimeter， the proportion of stomatal area to leaf area， stomatal area index and stomatal opening area index. Using principal component analysis to 12 characters summarized as three principal components（the cumulative contribution rate is 93.408%）， the first principal component load mainly was stomatal density， the second principal component load mainly was stomatal opening area index， and the last principal component load mainly was stomatal area index. The 108 germplasm resources were clustered into three types， one of the types was drought-resistant and water-conserving which included 31 germplasm resources were suitable for planting in arid areas. The stomatal density， stomatal open area index and stomatal area index can be used as the effective indexes for evaluating drought resistance of germplasm resources of yellowhorn.

Key words: Xanthoceras sorbifolium, Stomata, The drought, Germplasm resources

CLC Number:

S727.32

Meng-Ke WANG, Meng-Ni TIAN, Quan-Xin BI, Xiao-Juan LIU, Hai-Yan YU, Li-Bing WANG. Evaluation of Drought Tolerance Based on Stomatal Characters and Selection of Germplasm Resources from Xanthoceras sorbifolia[J]. Bulletin of Botanical Research, 2021, 41(6): 957-964.

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