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 Posted: Tue 5:47, 15 Feb 2011 Post subject: belstaff uomo Sister lines of maize single cross i |
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Sister lines of maize single cross improved seed technology
Hybrids fully retains the corresponding characteristics of conventional single-cross hybrid: the High Resistance to ear rot and moderately resistant corn rust, stay green long period, can live trees mature. The results can be seen from the above, Paul Yu 7,[link widoczny dla zalogowanych], I5 single cross hybrids can be improved to better maintain its corresponding conventional single cross yield potential is also close to uniformity, and adaptability than in the corresponding conventional single cross improved, therefore more favorable to the winning high and stable yield. 7, 212 Paul Yu orthogonal B107 × B108 or B107 × B103 can be used as female with C-B107. Preparation of C-type single cross. But the B103 or B108, respectively, as male parent, the growing weaker, less pollen. Therefore, the use of B103 × B108 for the preparation of the male CB107 × (BlO3 × B108), and its corresponding orthogonal CB107 × B103 and CBl07 × B108 as a comparative test in order to identify as male parent with a sister species of the feasibility. The results showed that sister species in the same combination in both reciprocal crosses as female or as male parent, the F generation of production and major economic traits are similar. Therefore, the system can use as needed on the kinds of sibling species as female parent, but also as male parent. 2.2 The use of sister species as the female parent's turned kind of test is the male parent with a B107, I], 103, and B108 and their sister species (B108 × B103) as female parent to do community seed comparison test, repeat 4 times. The results are as follows: (1) Yield: modified single-cross hybrid sister lines (B108 × B103) × B107 4380 kg per hectare, the two corresponding conventional single cross B103 × B107 3615 kg per hectare, B108 × B107 per hectare 3135 kg. Department of modified single-cross sister species of copper than the corresponding conventional single cross seed yield per hectare, 21.6% ~ 40.2%, average increase 30.2%. (2) major economic traits: Department asked the sister B103 × B108 hybrid of the two parents than any other show a clear advantage first 3 to 4 days early emergence, seedling growth and rapid seedling age 15 in 1991, seedlings of measurement results sister species of the ground part of the hybrid from 7.6 to 8.1 g fresh weight, compared with the white cross of two sister lines (3 to 4 grams) is about twice as fast growth rate, which in the mountains, under the conditions of dry seed, the use of sibling species easier for the whole seedling seedlings. In addition, the sister plant roots than the inbred lines and strong, grains per spike, 25.5%, 12.7% higher grain weight, these differences are sister lines to change the system of 16 species of good yielding single-cross the main reason. 2.3 Modified single cross mountain dry seed test demonstration. 1992 to 1994 in the north-west elevation of 1870 meters Shidian dry mountain improvements for the larger experimental demonstration of single cross seed. Red for the mountain farming system, medium fertility, SSP 750 kg per hectare, 150 kg of potassium sulfate, urea 600 kg,[link widoczny dla zalogowanych], thanks to the natural rain water. Test 185 hectares in 1992, an average of 29,[link widoczny dla zalogowanych],385 kg per hectare, compared to the control field (conventional single cross seed 0.17 hectares, producing 2,[link widoczny dla zalogowanych],064 kilograms per hectare) yield 42.4%; 1993 model 7.0l hectares, the average per hectare production 38l3 kg, compared with conventional single cross seed (2835 kg) yield 34.5%; l0 A pair of Model 1994 hectares,[link widoczny dla zalogowanych], an average of 2,746.5 kg per hectare, compared with conventional single cross seed (2103 kg) yield 30.6 %. 3 Year Total Demonstration {} j species l8.87 hectares, an average of 3,166.5 kg per hectare, compared with conventional single-species cross-Pina (2334 kg) the average yield of 35.7%, most of which model to 3000 per hectare 4500 kg, up to 6700.5 kg. 3 Summary Yu-7, 31 by Paul sibling species as the female parent to cross a single seed can be modified to maintain its conventional single-cross hybrids of the uniformity, and to increase seed production 30%, and the production of seed grain large, in the mountains All seedlings planted seedling dry easily conducive to production. Sister species as the female parent than 3.2 direct production of seeds, may also be needed in its anti-crosses as male parent seed in order to increase male vigor and pollen production, thus indirectly promoting seed yield. Generated in this way a generation hybrids, regardless of ability or uniformity with all its orthogonal similar. 3.3 The use of sister lines of single cross seed production techniques improved, due to parents showed significant improvement of life force, which has the potential to expand seed production to adapt to the mountain upland areas, not only can improve the ability of maize seed self-sufficiency is a mountain people become rich opportunities .
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