4.7 Article

Ecophysiological Responses of Tall Wheatgrass Germplasm to Drought and Salinity

期刊

PLANTS-BASEL
卷 11, 期 12, 页码 -

出版社

MDPI
DOI: 10.3390/plants11121548

关键词

tiller density; leaf length; 13-carbon isotope; water-use efficiency; Na+/K+ ratio; proline; K+ concentration; Na+ and Cl- concentration; combined stress; C3 grass

资金

  1. Xunta de Galicia [ED431C 2019/20]

向作者/读者索取更多资源

This study aimed to investigate the ecophysiological responses of accessions from different environmental origins under drought and salinity conditions in tall wheatgrass. The results showed that accessions with superior stress tolerance can be identified using the combination of delta C-13 value, Na+/K+ ratio, and canopy structural variables. The stress tolerance of tall wheatgrass can be utilized to expand forage production.
Tall wheatgrass (Thinopyrum ponticum (Podp.) Barkworth and D.R. Dewey) is an important, highly salt-tolerant C3 forage grass. The objective of this work was to learn about the ecophysiological responses of accessions from different environmental origins under drought and salinity conditions, to provide information for selecting superior germplasm under combined stress in tall wheatgrass. Four accessions (P3, P4, P5, P9) were irrigated using combinations of three salinity levels (0, 0.1, 0.3 M NaCl) and three drought levels (100%, 50%, 30% water capacity) over 90 days in a greenhouse. The control treatment showed the highest total biomass, but water-use efficiency (WUE), delta C-13, proline, N concentration, leaf length, and tiller density were higher under moderate drought or/and salinity stress than under control conditions. In tall wheatgrass, K+ functions as an osmoregulator under drought, attenuated by salinity, and Na+ and Cl- function as osmoregulators under salinity and drought, while proline is an osmoprotector under both stresses. P3 and P9, from environments with mild/moderate stress, prioritized reproductive development, with high evapotranspiration and the lowest WUE and delta C-13 values. P4 and P5, from more stressful environments, prioritized vegetative development through tillering, showing the lowest evapotranspiration, the highest delta C-13 values, and different mechanisms for limiting transpiration. The delta C-13 value, leaf biomass, tiller density, and leaf length had high broad-sense heritability (H-2), while the Na+/K+ ratio had medium H-2. In conclusion, the combined use of the delta C-13 value, Na+/K+ ratio, and canopy structural variables can help identify accessions that are well-adapted to drought and salinity, also considering the desirable plant characteristics. Tall wheatgrass stress tolerance could be used to expand forage production under a changing climate.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据