An interactive effect of nitric oxide and 24-epibrassinolide (EBL) or 28-homobrassinolide (HBL) was investigated in Lycopersicon esculentum Mill. cv. K-21. Seeds prior to sowing were exposed to sodium nitroprusside (SNP) (0, 10−5 M or 1 M), a nitric oxide donor, for 8 h, and the resulting seedlings were subsequently sprayed with 10−8 M EBL or HBL at 30-day stage. The analysis of plant samples after 24 h of the EBL or HBL spray showed that the lower SNP concentration (10−5 M) favored the growth, pigment content, photosynthetic and enzymatic activities, and also improved the antioxidant system. However, 1 M SNP had inhibitory impact on most of the indices, except the antioxidant system. Brassinosteroids (EBL or HBL), on the other hand, had a stimulatory impact on the aforementioned indices. The inhibitory effect of SNP (1 M) was neutralized by the application of BRs, where EBL was more effective than HBL.
Russian Journal of Plant Physiology – Springer Journals
Published: Mar 25, 2010
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