Assessment of physiological efficiency of cassava genotypes under salt stress
Kalarani MK, Velmurugan M, Kavitha PS
The present investigation was carried out during 2019-2020 at Tapioca and Castor Research Station, Tamil Nadu Agricultural University, Yethapur to assess the physiological efficiency of cassava genotypes under salt stress. The experiment was initiated with cassava YTP2 and TCMS 7 (salt tolerant), H226 and Kunguma rose (moderately salt tolerant) and Sree Athulya (salt susceptible) with two level of salt treatments viz., control and 120mM NaCl. Cement structures were established with the height of 20cm and width of 30cm for adding salt water. Only one plant was maintained in each structure. Salt water treatments were imposed from day one of planting to 120 days after planting once in three days. Experiment was replicated five times and followed Completely Randomized Factorial Design. The results revealed that, cassava genotype YTP2 recorded maximum super oxide dismutase, catalase and peroxidase activity.Higher osmotic adjustment of 1.9 Mpa and 1.7 Mpa was seen in YTP2 and H226 leaves respectively. With respect to osmotic potential, more reduced potential was observed in TCMS7 (-3.8 Mpa) followed by YTP2 (-3.6 Mpa) and also minimum reduction on tuber yieldwas observed in YTP2 (17.3 %) under salt stress.