Effects Of Yield And Physiological Indexes On Screening Different High-Oleic Acid Peanut Varieties And Lines Under Saline-Alkali Stress

Nearly two-third of the world's cultivated land belongs to saline-alkali type having very little agricultural impact. Peanut (Arachis hypogea L.) can be a promising crop to cultivate in this type of soils in the People's Republic of China. Peanut is a suitable crop to grow in neutral acid soils but salt alkali stress affects peanuts production. However, it has been seen that different peanut varieties show different salt stress tolerances. In the present investigation, distinct peanut varieties differing in salt tolerance were initially identified from two separate experiments using two systems. The first screening involved two diverse groups of 27 high oleic acid peanut entries. The yield was determined to screen the cultivars for differences in salt tolerance of field test for 2016 and 2017 in the first experiment. A set of four varieties (three tolerant and one susceptible) were selected from this experiment against Fuhua 12 (normal oleic) as a control. The varieties were then subjected again to salt stress adopting pot culture system in the second experiment being involved in a screening approach on yield, yield-related traits and physiological indexes. The results suggested that: Huayu 967 and Huayu 669 were medium tolerant, 16L2 low tolerant, 16S5, Fuhua 12 susceptible. For the field test, more than 2950.05 kg/ha of pod yield can be selected as salt-tolerant varieties. Compared with the susceptible entries, the advantages of medium tolerant entries were grouped as follows. The first group was screened on the basis of the relative values of the numbers of pods, branches with pods and total pods which were higher than 60%. In it the salt tolerant index (STI) and economic yield were also high and was not less than 66%. The second group had the net photosynthetic rate values of medium tolerant entries under salt-alkali stress which were both higher than the normal soil. In this group the chlorophyll content of Huayu 967 was higher than other entries in each growth period. The final and the third group had been characterized as the malondialdehyde concentration of medium tolerant peanut increased little under salt-alkali stress. (C) 2020 Friends Science Publishers