Effect of carbohydrates and night temperature on night respiration in rice
| Autor: | Cherryl Quinones, Krishna S.V. Jagadish, Sandrine Roques, Anne Clément-Vidal, Michaël Dingkuhn, Jeroen Van Rie, Sébastien Peraudeau, Denis Fabre, Tanguy Lafarge, Pieter B.F. Ouwerkerk |
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| Rok vydání: | 2015 |
| Předmět: |
Perte
Light Physiology Métabolisme des glucides Climate Q10 adaptation aux changements climatiques F62 - Physiologie végétale - Croissance et développement Plant Science Facteur climatique F01 - Culture des plantes Biomasse Analyse de régression Photosynthesis U10 - Informatique mathématiques et statistiques Temperature Feuille Starch Facteur du milieu Darkness Rythme circadien Gases Respiration rate Teneur en glucides P40 - Météorologie et climatologie Cell Respiration Carbohydrates Oryza sativa Biology Acclimatization Animal science Dry weight Botany Respiration Croissance Sugar Changement climatique Oryza Température Respiration cellulaire Ombrage Plant Leaves Light intensity Solubility Linear Models Shading |
| Zdroj: | Journal of Experimental Botany |
| ISSN: | 1460-2431 |
| Popis: | Global warming causes night temperature (NT) to increase faster than day temperature in the tropics. According to crop growth models, respiration incurs a loss of 40-60% of photosynthate. The thermal sensitivity of night respiration (R(n)) will thus reduce biomass. Instantaneous and acclimated effects of NT on R(n) of leaves and seedlings of two rice cultivars having a variable level of carbohydrates, induced by exposure to different light intensity on the previous day, were investigated. Experiments were conducted in a greenhouse and growth chambers, with R(n) measured on the youngest fully expanded leaves or whole seedlings. Dry weight-based R(n) was 2.6-fold greater for seedlings than for leaves. Leaf R(n) was linearly related to starch (positive intercept) and soluble sugar concentration (zero intercept). Increased NT caused higher R(n) at a given carbohydrate concentration. The change of R(n) at NT increasing from 21 °C to 31 °C was 2.4-fold for the instantaneous response but 1.2- to 1.7-fold after acclimation. The maintenance component of R(n) (R(m)'), estimated by assimilate starvation, averaged 28% in seedlings and 34% in leaves, with no significant thermal effect on this ratio. The acclimated effect of increased NT on R(m)' across experiments was 1.5-fold for a 10 °C increase in NT. No cultivar differences were observed in R(n) or R(m)' responses. The results suggest that the commonly used Q10=2 rule overestimates thermal response of respiration, and R(n) largely depends on assimilate resources. |
| Databáze: | OpenAIRE |
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