Unravelling the diversity in water usage among wild banana species in response to vapour pressure deficit

Frontiers in Plant Science

Plant Science

Clara Gambart¹  David Eyland¹  Sebastien Carpentier²  Rony Swennen³ 

[1] Laboratory of Tropical Crop Improvement, Division of Crop Biotechnics, KU Leuven, Heverlee, Belgium;Laboratory of Tropical Crop Improvement, Division of Crop Biotechnics, KU Leuven, Heverlee, Belgium;Bioversity International, Biodiversity for Food and Agriculture, Leuven, Belgium;Laboratory of Tropical Crop Improvement, Division of Crop Biotechnics, KU Leuven, Heverlee, Belgium;International Institute of Tropical Agriculture, Banana Breeding, Kampala, Uganda;

关键词: drought tolerance;    stomatal conductance;    transpiration;    vapour pressure deficit;    water use efficiency;    wild banana species;    breeding;   

DOI  :  10.3389/fpls.2023.1068191

 received in 2022-10-12, accepted in 2023-08-03,  发布年份 2023

来源: Frontiers

【 摘 要 】

The rise in global temperature is not only affecting plant functioning directly, but is also increasing air vapour pressure deficit (VPD). The yield of banana is heavily affected by water deficit but so far breeding programs have never addressed the issue of water deficit caused by high VPD. A reduction in transpiration at high VPD has been suggested as a key drought tolerance breeding trait to avoid excessive water loss, hydraulic failure and to increase water use efficiency. In this study, stomatal and transpiration responses under increasing VPD at the leaf and whole-plant level of 8 wild banana (sub)species were evaluated, displaying significant differences in stomatal reactivity. Three different phenotypic groups were identified under increasing VPD. While (sub)species of group III maintained high transpiration rates under increasing VPD, M. acuminata ssp. errans (group I), M. acuminata ssp. zebrina (group II) and M. balbisiana (group II) showed the highest transpiration rate limitations to increasing VPD. In contrast to group I, group II only showed strong reductions at high VPD levels, limiting the cost of reduced photosynthesis and strongly increasing their water use efficiency. M. acuminata ssp. zebrina and M. balbisiana thus show the most favourable responses. This study provides a basis for the identification of potential parent material in gene banks for breeding future-proof bananas that cope better with lack of water.

【 授权许可】

Unknown   
Copyright © 2023 Eyland, Gambart, Swennen and Carpentier