کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4554553 1628091 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ethylene improves Arabidopsis salt tolerance mainly via retaining K+ in shoots and roots rather than decreasing tissue Na+ content
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Ethylene improves Arabidopsis salt tolerance mainly via retaining K+ in shoots and roots rather than decreasing tissue Na+ content
چکیده انگلیسی

Ethylene has been reported to play an essential role in the response of Arabidopsis to salinity and K+ deficiency. It was proposed that plant's ability to maintain potassium (K+) and minimize sodium (Na+) in tissues of salinity plants is critical for salt tolerance (ST). It is still unclear how ethylene modulates plant ion homeostasis under saline occasions. We employed Arabidopsis wild type (Col-0), ethylene insensitive mutants (ein2-5 and ein3-1) and constitutive triple response mutant (ctr1-1) plants to compare their phenotypic and physiological responses to salinity. Ethephon applied to plants could convert quickly to ethylene and here was applied exogenously to Col-0 seedlings to validate ethylene role in salt response. We showed that ethylene insensitivity in ein2-5 or ein3-1 plants increased Arabidopsis salt sensitivity than in Col-0. However, the salinity-induced adverse effects on Chlorophyll a/b, photosystem II function (Fv/Fm) and redox state were largely amended in the ctr1-1 than in Col-0 plants with the severe salinity. The compatible solute sucrose and antioxidant system were also up-regulated to improve ST in ctr1-1 plants. The ethephon obviously alleviated the salinity-induced restriction in root length. The subsequent analysis on the Na+ and K+ homeostasis found that ethylene could help plant retain higher shoot or root K+ nutrition in the short- or long-term salt-stressed plants. However, the ethylene did not significantly alter sodium buildup and water relation in the salt-stressed plants. Our observations confirmed the key role of ethylene in improved plant ST and highlighted the ethylene ability to retain K+, rather than decreasing Na+, in shoots and roots to improve Arabidopsis ST.

Research highlights▶ Ethylene signaling help improve Arabidopsis salt tolerance. ▶ Improved salt tolerance relates to higher K+ and K+/Na+ ratio. ▶ Ethylene signaling modulates antioxidant systems and compatible adjustment. ▶ Exogenous ethephon retains salt-induced K+ loss.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental and Experimental Botany - Volume 86, February 2013, Pages 60–69
نویسندگان
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