Loading...
Please wait, while we are loading the content...
Similar Documents
Reproductive Stage Drought Tolerance in Wheat: Importance of Stomatal Conductance and Plant Growth Regulators
| Content Provider | MDPI |
|---|---|
| Author | Onyemaobi, Olive Sangma, Harriet Garg, Gagan Wallace, Xiaomei Kleven, Sue Suwanchaikasem, Pipob Roessner, Ute Dolferus, Rudy |
| Copyright Year | 2021 |
| Description | Drought stress requires plants to adjust their water balance to maintain tissue water levels. Isohydric plants (‘water-savers’) typically achieve this through stomatal closure, while anisohydric plants (‘water-wasters’) use osmotic adjustment and maintain stomatal conductance. Isohydry or anisohydry allows plant species to adapt to different environments. In this paper we show that both mechanisms occur in bread wheat (Triticum aestivum L.). Wheat lines with reproductive drought-tolerance delay stomatal closure and are temporarily anisohydric, before closing stomata and become isohydric at higher threshold levels of drought stress. Drought-sensitive wheat is isohydric from the start of the drought treatment. The capacity of the drought-tolerant line to maintain stomatal conductance correlates with repression of ABA synthesis in spikes and flag leaves. Gene expression profiling revealed major differences in the drought response in spikes and flag leaves of both wheat lines. While the isohydric drought-sensitive line enters a passive growth mode (arrest of photosynthesis, protein translation), the tolerant line mounts a stronger stress defence response (ROS protection, LEA proteins, cuticle synthesis). The drought response of the tolerant line is characterised by a strong response in the spike, displaying enrichment of genes involved in auxin, cytokinin and ethylene metabolism/signalling. While isohydry may offer advantages for longer term drought stress, anisohydry may be more beneficial when drought stress occurs during the critical stages of wheat spike development, ultimately improving grain yield. |
| Starting Page | 1742 |
| e-ISSN | 20734425 |
| DOI | 10.3390/genes12111742 |
| Journal | Genes |
| Issue Number | 11 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-29 |
| Access Restriction | Open |
| Subject Keyword | Genes Plant Sciences Drought Stress Wheat Stomatal Conductance Spike Development Transcriptome Aba Auxin Cytokinin Isohydric Anisohydric |
| Content Type | Text |
| Resource Type | Article |
