Physiological Basis for Productivity in Sweet Corn (zea mays l. Saccharata) Genotypes
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Date
2016-06
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University of Agricultural Science, Dharwad
Abstract
A field experiment was conducted to study physiological basis of productivity in 13 sweet corn genotypes. During the course of investigation morpho-physiological, biophysical, biochemical, growth, yield and yield attributes were studied at different crop growth stages.
Maximum values were recorded for plant height in genotype FSCH-55 (227.60 cm), leaf area in genotype ADVSW-1 (72.83 dm2 plant-1), total dry matter production in genotype ADVSW-1 (174.20 g plant-1), days to 50 per cent tasselling in genotype ADVSW-1 (53.67), days to 50 per cent silking in genotype ADVSW-1 (58.00), anthesis to silking interval in genotype Priya-C (6.0 days), maximum photosynthetic rate in genotype ADVSW-1 (18.40 ยต mol CO2 m-2 s-1), SPAD value in genotype ADVSW-1 (57.07), brix meter reading in genotype BSCH 6 (23.01). Maximum values were noticed for growth parameters viz., LAI (ADVSW-1, 6.07), LAD (ADVSW-1, 89.57 days), AGR (ADVSW-1, 1.91 g plant-1 day-1), CGR (ADVSW-1, 15.93 g m-2 day-1), RGR (WOSC-C, 5.23 mg g-1 day-1 x 10-3) and NAR (WOSC-C, 15.64 mg dm-2 day-1 x 10-3). Maximum values were recorded for biochemical parameters viz., protein content (17.09 mg g-1 of fresh weight in FSCH 75), starch content (383.90 mg g-1 of fresh weight in ADVSW-2), reducing sugar (66.88 mg g-1 of fresh weight in QMHSC-1182), non-reducing sugars (366.60 mg g-1 of fresh weight in ADVSW-2) and total sugar content (432.90 mg g-1 of fresh weight in ADVSW-2). Maximum fresh cob yield (250.50 q ha-1) in ADVSW-1, higher stover (green stalk) yield (284.60 q ha-1) in ADVSW-1, maximum harvest index (46.86 %) in ADVSW-2 was noticed. During shelf life period the protein content, reducing sugar, non-reducing sugar and total sugar content decreased from harvest to post harvest stage whereas starch content increased.
Among all the genotypes, ADVSW-1, BSCH 6 and ADVSW-2 showed higher total sugars, proteins, photosynthetic rate and higher yield.
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