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논문 기본 정보

자료유형
학술저널
저자정보
Forghani, Amir Hossein (Department of Biology, University of Isfahan) Almodares, Abbas (Department of Biology, University of Isfahan) Ehsanpour, Ali Akbar (Department of Biology, University of Isfahan)
저널정보
한국응용생명화학회 Applied Biological Chemistry Applied Biological Chemistry 제61권 제1호
발행연도
2018.1
수록면
113 - 124 (12page)

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The phytohormones are important in plant adaptation to abiotic and biotic stresses by facilitating a wide range of adaptive responses. Application of gibberellic acid ($GA_3$) and paclobutrazol (PBZ) as $GA_3$ inhibitors have been shown to affect salinity tolerance through modulating phytohormones. The aim of this study was to find out the potential objectives for $GA_3$ and PBZ as affected by salinity through altering the phytohormones and biochemical parameters in sweet sorghum. Following seed germination, seedlings were cultured in Hoagland nutrient solution containing NaCl supplemented with $GA_3$ and PBZ for 12 days. The results were analyzed by principal component analysis to identify the best target(s) for salinity, $GA_3$, and PBZ in sweet sorghum. Paclobutrazol associated with salt improved root/shoot length, carotenoid, and total chlorophyll by modulating cytokinin $(CK)/GA_3$, indole acetic acid $(IAA)/GA_3$, and total polyamines/$GA_3$ ratios. Gibberellic acid-treated plants not exposed to salinity treatments notably improved phytohormones content such as cytokinin, auxin, abscisic acid (ABA), and polyamines resulting in increased stem growth. Moreover, the main objectives of $GA_3$ were ABA, spermidine, and $ABA/GA_3$ ratio in response to salinity. Though $GA_3$ and PBZ have different roles against salt stress, $ABA/GA_3$ ratio was a similar target of $GA_3$ and PBZ. This work suggests that altered levels of $GA_3$ resulting from PBZ- and $GA_3$-treated plants cause different allocation patterns in sweet sorghum by regulation of $CK/GA_3$, $IAA/GA_3$, and total polyamines/$GA_3$ ratio. Also, accumulation chlorophyll pigments, carotenoids, and water soluble carbohydrates of sorghum plants under salinity regulated by total polyamines/$GA_3$ and $ABA/GA_3$ ratios positively correlated with PBZ application.

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