Stress Tolerance Profiling of a Collection of Extant Salt-Tolerant Rice Varieties and Transgenic Plants Overexpressing Abiotic Stress Tolerance Genes

Plant & Cell Physiology
Ken-Ichi KurotaniShin Takeda

Abstract

Environmental stress tolerance is an important trait for crop improvement. In recent decades, numerous genes that confer tolerance to abiotic stress such as salinity were reported. However, the levels of salt tolerance differ greatly depending on growth conditions, and mechanisms underlying the complicated nature of stress tolerance are far from being fully understood. In this study, we investigated the profiles of stress tolerance of nine salt-tolerant rice varieties and transgenic rice lines carrying constitutively expressed genes that are potentially involved in salt tolerance, by evaluating their growth and viability under salt, heat, ionic and hyperosmotic stress conditions. Profiling of the extant varieties and selected chromosome segment substitution lines showed that salt tolerance in a greenhouse condition was more tightly correlated with ionic stress tolerance than osmotic stresses. In Nona Bokra, one of the most salt-tolerant varieties, the contribution of the previously identified sodium transporter HKT1;5 to salt tolerance was fairly limited. In addition, Nona Bokra exhibited high tolerance to all the stresses imposed. More surprisingly, comparative evaluation of 74 stress tolerance genes revealed that the most str...Continue Reading

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Citations

Oct 7, 2016·Frontiers in Plant Science·Kiyomi Abe, Hiroaki Ichikawa
Feb 2, 2018·Frontiers in Plant Science·Ruidang QuanRongfeng Huang
May 28, 2019·International Journal of Molecular Sciences·Md Masud RanaToshiaki Mitsui
Sep 12, 2019·Plants·Hieu Trang NguyenAntony Champion
Mar 27, 2020·Frontiers in Bioengineering and Biotechnology·Ge ZhaoJiahe Wu
Nov 14, 2020·International Journal of Molecular Sciences·Hua QinRongfeng Huang

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