Abstract
This research was conducted to investigate the morpho-physiological effects of salicylic acid and jasmonic acid on soybean performance and productivity under salinity. Leaf chlorophyll content index, carotenoids and anthocyanins content, photosystem II efficiency, relative water content, leaf area, leaf mass, specific leaf area, water use efficiency, seed filling duration, assimilate mobilization efficiency and seed mass decreased, but leaf temperature, specific leaf mass and electrolytic leakage of leaves increased with enhancing salinity. Salicylic acid improved leaf chlorophyll content index, anthocyanins content, leaf area, specific leaf area, water use efficiency, seed filing duration, assimilate mobilization efficiency and seed mass under both saline and non-saline conditions. The superior effects of salicylic acid on some traits such as maximum quantum yield of PSII, relative water content and leaf electrolytic leakage only occurred under different salinity levels. Jasmonic acid improved leaf mass, specific leaf mass, carotenoids content, relative water content, seed filling rate and reduced chlorophyll content index, leaf temperature, leaf area, specific leaf area, seed filling duration, assimilates mobilization efficiency and relative electrolytic leakage of soybean, with no significant effects on photosystem II efficiency and seed mass. Application of salicylic acid was, therefore, the superior treatment for enhancing physiological performance and seed mass of soybean plants under different salinity levels.
Highlights
This research was conducted to investigate the morphophysiological effects of salicylic acid and jasmonic acid on soybean performance and productivity under salinity
The number of seeds, pods and yield are directly related to the number of flowers per nodes and node number can be reduced by environmental stresses (Jiang & Egli, 1993)
The Chlorophyll content index (CCI) was decreased with increasing salinity
Summary
This research was conducted to investigate the morphophysiological effects of salicylic acid and jasmonic acid on soybean performance and productivity under salinity. Carotenoids and anthocyanins content, photosystem II efficiency, relative water content, leaf area, leaf mass, specific leaf area, water use efficiency, seed filling duration, assimilate mobilization efficiency and seed mass decreased, but leaf temperature, specific leaf mass and electrolytic leakage of leaves increased with enhancing salinity. Jasmonic acid improved leaf mass, specific leaf mass, carotenoids content, relative water content, seed filling rate and reduced chlorophyll content index, leaf temperature, leaf area, specific leaf area, seed filling duration, assimilates mobilization efficiency and relative electrolytic leakage of soybean, with no significant effects on photosystem II efficiency and seed mass. Disturbances of photosynthesis at the molecular level are related to the restricted electron transport through PSII and/or with structural injuries to PSII (Ghassemi-Golezani & Lotfi, 2015) Under environmental stresses such as drought and salinity, plant leaves are dehydrated, and photosynthesis is decreased. GhassemiGolezani et al (2010) showed that salinity reduced seed filling period and yield in different cultivars of soybean
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