Nondestructive Phenomic Tools for the Prediction of Heat and Drought Tolerance at Anthesis in Brassica Species
| Autor: | Yiming Guo, Katia Stefanova, Renu Saradadevi, Neil C. Turner, Kadambot H. M. Siddique, Sheng Chen, Matthew N. Nelson, Robert T. Furbank, Wallace Cowling, Xavier Sirault |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Germplasm Stomatal conductance Drought tolerance Brassica QH426-470 Photosynthesis Photochemical Reflectance Index 01 natural sciences SB1-1110 03 medical and health sciences Anthesis Genetics 030304 developmental biology 2. Zero hunger 0303 health sciences biology fungi Botany food and beverages Plant culture biology.organism_classification Horticulture Volume (thermodynamics) QK1-989 Agronomy and Crop Science Research Article 010606 plant biology & botany |
| Zdroj: | Plant Phenomics, Vol 2019 (2019) Plant Phenomics |
| ISSN: | 2643-6515 |
| Popis: | Oilseed Brassica species are vulnerable to heat and drought stress, especially in the early reproductive stage. We evaluated plant imaging of whole plant and flower tissue, leaf stomatal conductance, leaf and bud temperature, photochemical reflectance index, quantum yield of photosynthesis, and leaf gas exchange for their suitability to detect tolerance to heat (H) and/or drought (D) stress treatments in 12 Brassica genotypes (G). A replicated factorial experiment was set up with 7 d of stress treatment from the beginning of anthesis with various levels of three factors H , D , and G . Most phenomics tools detected plant stress as indicated by significant main effects of H , D , and H×D . Whole plant volume was highly correlated with fresh weight changes, suggesting that whole plant imaging may be a useful surrogate for fresh weight in future studies. Vc max , the maximum carboxylation rate of photosynthesis, increased rapidly on day 1 in H and H+D treatments, and there were significant interactions of G×H and G×D . Vc max of genotypes on day 1 in H and H+D treatments was positively correlated with their harvested seed yield. Vc max on day 1 and day 3 were clustered with seed yield in H and H+D treatments as shown in the heatmaps of genotypic correlations. TPU, the rate of triose phosphate use, also showed significant positive genotypic correlations with seed yield in H+D treatments. Flower volume showed significant interactions of G×H and G×D on day 7, and flower volume of genotypes on day 7 in H was positively correlated with their harvested seed yield. There were few interactions of G×H or G×D for leaf stomatal conductance, leaf and bud temperature, photochemical reflectance index, and quantum yield of photosynthesis. Vc max , TPU, and volume of flowers are potential nondestructive phenomic traits for heat or combined heat and drought stress tolerance screening in Brassica germplasm. |
| Databáze: | OpenAIRE |
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