Growth improvement and pigment composition in cowpea (Vigna unguiculata (L.) Walp.) by foliar spray of salicylic acid and ascorbic acid under Nacl stress
Reyaz Ahmad Mir, R Somasundaram
Salinity stress is a big hurdle towards growing population as it accounts for a huge loss of crop productivity. So, alternative approaches are to be made to increase crop resistance towards various climatic entities including drought, salt so on. One approach is the exogenous supply of salicylic acid - a potential regulator and ascorbic acid -a strong antioxidant. In this view, a pot culture experiment was stuided to investigate the impact of salicylic acid (SA) and ascorbic acid (AsA) on growth and pigment contents of cowpea at 200mM NaCl stress. Plants were harvested randomly on 30th, 40th and 50th DAS for estimation of growth traits and pigment contents. Salt stress causes a reduction in the growth attributes like root, and shoot length, fresh weight and dry weight, chlorophyll a, b, total chlorophyll and carotenoids. The foliar spray of SA and AsA improved NaCl resistance in cowpea by increasing root length, shoot length, fresh weigh and dry weigh, chlorophyll pigments and carotenoids contents. Overall, SA and AsA foliar application completely counteracted the NaCl stress led deleterious effects at 200mM in cowpea. Thus, it can be concluded that foliar spray of SA and AsA induced tolerance to NaCl stress in cowpea due to enhanced growth and pigment contents.