| Effects of exogenous nitric oxide on growth and osmoregulatory capability of maize (Zea mays L.) seedlings under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2016.02.28 |
| Key Words: maize seedlings nitric oxide NaCl stress osmotic adjustment |
| Author Name | Affiliation | | XUE Ying-wen | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Heilongjiang Province Ministry Laboratory of Improvement & Cultivation of Cold Crop Germplasm, Daqing, Heilongjiang 163319, China | | WANG Yu-feng | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Heilongjiang Province Ministry Laboratory of Improvement & Cultivation of Cold Crop Germplasm, Daqing, Heilongjiang 163319, China | | YANG Ke-jun | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Heilongjiang Province Ministry Laboratory of Improvement & Cultivation of Cold Crop Germplasm, Daqing, Heilongjiang 163319, China | | YU Li-he | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Heilongjiang Province Ministry Laboratory of Improvement & Cultivation of Cold Crop Germplasm, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| A water culturing method was adopted to study the effects on the growth and osmoregulatory capability of maize seedling under NaCl stress and exogenous nitric oxide (NO) donor sodium nitroprusside (SNP) that was applied with three levels of treatments including 50, 100 μmol·L-1 and 200 μmol·L-1. The results indicated that the exogenous nitric oxide (N
O) could alleviate the inhibited growth induced by NaCl stress. Compared with the treatment without applying SNP, the total whole plant dry weight with 100 μmol·L-1 SNP was increased by 19%. The contents of soluble sugar and soluble protein in leaves of seedlings and roots were reduced by exogenous nitric oxide (NO), being decreased by 19.9% and 7.9% in leaves and the 9.6% and 9% in roots, respectively. The content of Na+ in roots, young blade and mature sheath of maize seedling under salt stress was apparently decreased by 38.4%, 5.1% and 17.2% through the application of exogenous NO, respectively. The contents of K+, Ca2+, and Mg2+ in root and mature sheath were rather increased. The ratios of Na+/K+ and Na+/Ca2+ in different organs of maize seedling were decreased, and the ions balance in maize seedling under salt stress was maintained by exogenous NO. Exogenous NO caused subtle effect on the mature blade. It was concluded that exogenous nitric oxide (NO) can keep the balance of carbon-nitrogen metabolism, improve ions uptake and distribution in maize seedling under NaCl stress, and alleviate the damage induced by NaCl stress. The concentration of SNP for the most apparent result was 100 μmol·L-1. |
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