Salt tolerance screening and fertility performance of rice varieties in saline areas of Xinjiang
[Objective]To explore the salt tolerance of different rice varieties and screen out rrice varie-ties that would be suitable for cultivation in saline areas of Xinjiang.[Methods]Studies on the effects of dif-ferent salt concentration stress on agronomic traits and yield of newly selected rice varieties were conducted for two consecutive years throughout the reproductive period.[Results]Using treatment C100(2021)and treatment C120(2022)as identification criteria,Xin Japonica 14,Xin Japonica Xiang 3 and Xin Japonica Xiang 5 were"very strong"salt tolereties varieties;Xin Japonica 6,14GY44-5-1-7,Xin Japonica 12 and Xin Japonica Xiang 2 were"strong"salt tolereties varieties;New Japonica 8,New Rice 11,15GY65-3-2-1,New Japon-ica 11,Akita Komachi,New Rice 36,Yanfeng 47,12GY11-5-4-3-1-1,New Japonica 4,16GY54-2-3-1,New Japonica 9 were"stronger"salt tolereties varieties;Xin Japonica 10,Xin Japonica 13,15GY114-2-5-3-10,Xin Japonica Salt 02 and 15GY114-2-5-3 were"medium"salt tolereties varieties;9HR156,Xin Japonica 18 and Koshihikari were"weaker"salt tolereties varieties;03GY28-1-10-2-2-1 were"weak"salt tolereties varieties.[Conclusion]The results showed that the seedling survival rate,SPAD value and plant height of different rice varieties showed a decreasing trend with the increase of salt concentra-tion in each reproductive period;The main spike length,main spike seed setting rate,1,000-grain weight,and yield per plant of various rice varieties at maturity stage showed a decreasing trend with the increase of salt concentration,while excessive salt concentration would cause seedling death;Salinity tolerance of different rice varieties differed under the same salt concentration treatment.Three varieties with"very strong"salt tolerance were selected;Four varieties with"strong"salt tolerance;Eleven varieties with"stronger"salt tolerance;Five varieties with"medium"salt tolerance;Three varieties with"weaker"salt tolerance;One variety with"weak"salt tolerance.
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