UV‐B and Drought Stress Influenced Growth and Cellular Compounds of Two Cultivars of Phaseolus vulgaris L. (Fabaceae). (5th September 2020)

• Record Type: Journal Article
• Authors: Santos, Déborah Y.A.C.; Ferreira, Marcelo J. P.; Matos, Tamara Machado; Sala‐Carvalho, Wilton Ricardo; Anselmo‐Moreira, Fernanda; Roma, Lucas Paradizo; Carvalho, Juliana Cajado Souza; Peña‐Hidalgo, Miguel; French, Kristine; Waterman, Melinda J.; Robinson, Sharon A.; Furlan, Claudia M.
• Is Part Of: Photochemistry and photobiology. Volume 97:Number 1(2021)
• Page Start: 166
• Page End: 179
• Publication Date: 2020-09-05
• Subjects: Photochemistry -- Periodicals; Light -- Physiological effect -- Periodicals; 541.35
• DOI: 10.1111/php.13318
• Languages: English
• ISSNs: 0031-8655

Abstract

Abstract: Combined enhanced UV‐B radiation and drought may induce different morphological and physiological alterations in plants than either abiotic stress alone. We evaluated morphology, biomass, and primary and secondary metabolism changes in seedlings of two common bean cultivars, IAC Imperador (drought‐resistant) and IAC Milênio. To test the hypothesis that cultivars responded differently to combined stresses in a controlled environment, seedlings of the examined been cultivars were exposed to UV‐B and/or drought treatments for three weeks. The cultivars behaved differently, especially to the drought treatment, suggesting that they use different mechanisms to cope with unfavorable environmental conditions. IAC Imperador showed a stronger protective response, modifying wax composition and primary metabolism, and improving its resistance to UV‐B radiation. For IAC Imperador, the accumulation of cuticular wax and alkane was higher under combined stress but production of primary alcohols was reduced, suggesting a possible fatty acyl switch. Root/shoot length and biomass ratios increased in both cultivars, particularly for the combined stress, indicating a common plant response. We show that these two bean cultivars responded more strongly to UV‐B and combined stress than drought alone as evident in changes to their chemistry and biology. This shows the importance of investigating plant morphological and physiological responses to combined stress. Abstract : Cultivar IAC‐Imperador presented a protective response when submitted to drought by changing its wax and primary metabolite composition. During combined stress, the changes were more prominently increasing the root/shoot length ratio and biomass and possessing a higher alkane proportion in detriment of primary alcohols in cuticular wax composition. IAC‐Milênio was less responsive to stresses regarding metabolite composition than the other cultivar, only presenting an increase in root/shoot length and biomass when under combined stress.