National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Source and sink activity measured after anthesis in six poplar rice cultivars. The experiment was laid in randomized block design with six cultivars MTU-1001, MTU-1010, MTU-7029, BPT-2231, BPT-3291 and BPT-5204 replicated four times. After anthesis, top three leaves separately, top three internodes collectively, panicle axis and grain of main culm were sampled at seven day interval and analysed for biochemical parameters that serve remobilization of nutrients. During the initial and later halves of the sampling, there was a shift in higher amylase activity from third to flag leaves. Protease activity of leaves showed an increase in all the three leaves with age, with higher levels in flag leaves and lowest levels in third leaves. Amylase activity of the top three internodes increased till 14 DAA in MTU-1010, MTU-7029 and BPT-3291, while the increase continued till 21 DAA in MTU-1001, BPT-3291 and BPT- 5204, which later decreased in either case. Similar change in total carbohydrate contents were found in the top three internodes of main culm, which increased to a higher value and decreased later, with the exception of MTU-1010 in which increase in total carbohydrates was till 21 DAA. There were varietal differences in the total carbohydrate contents and amylase enzyme activities of panicle axis, during the sampling period. Total carbohydrate contents of panicle axis increased till 21 DAA, which later decreased. But, the amylase activity of panicle axis increased till either 14 DAA (MTU-1001, MTU-7029, BPT-2231 and BPT-3291) or 21 DAA (MTU-1010 and BPT-5204), which later decreased. Total carbohydrates and proteins of grains increased with maturity, which differed among varieties. Extent of increase in total carbohydrates of grain was higher in BPT-5204, while total proteins of grain increased to greater extent in BPT-3291.
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