Standard Heterosis in Newly Developed Rice Hybrids*
Of variant short and long term approaches being contemplated, exploitation of heterosis is widely recognized as the only readily available delegacy to raise the genetic gestate ceiling in areas where restorations welcome already approached potential level. China was the first country where yield barrier in semi – dwarf connatural sift was broken by successful development of strain hybrids which yield about 20% more than conventional inbred rice (virmani, et al., 1982). In this approach, development of highly heterotic rice hybrids that can choke the local popular high yielding rice inbred and evaluating them across the environments is the basic and most important activity. With this background, an experiment was conducted with an intent to assess the performance of rice hybrids and estimate the magnitude of timeworn heterosis over popular rice inbreds. The experiment using seven-spot newly developed rice hybrids and two check varieties was laid out in a randomized complete chock up design with two replications at Regional Agriculture investigate Station, Mandya during Kharif-2000.
E6 60.56* 36.62 29.58 30.99 53.52* 49.30* 36.62 -0.18 7.25 19.27 -7.19 35.77* 14.76 26.78* -12.01 26.49 12.72 35.30* 24.01 31.72 37.10* -4.37** 0.
049 -8.25** 12.14** 1.94 -10.19** -3.40* 16.41 129.29* 54.80 200.00 172.73** 65.66 137.37* @ P=0.05
Table-1:Standard heterosis of seven hybrids over two checks in respect of yield components across six environments. E1 E2 E3 E4 E5 E6 E1 E2 E3 E4 E5 1. Panicles per plant. Check-Jaya Check-IR 30864 1.APRH-2 36.76** 53.03** 162.96** 73.08* 48.81 60.56* 34.78** 65.57** 79.75** 32.35** 123.21* 2.DRRH-1 -4.41 13.64 77.78** 105.92 22.62 36.62 -5.80 22.95 21.52 57.35* 83.93* 3.PA 6201 13.24 27.27* 66.67** 51.92 52.38 29.58 11.59 37.70* 13.92 16.18 128.57* 4.Sahyadri -2.94 28.79* 77.78** 40.38 -7.14 30.99 -4.35 39.34* 21.52 7.35 39.29 5.PHB-71 -14.71 -22.73 70.37**...If you want to position a full essay, order it on our website: Ordercustompaper.com
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