Studies on the Evaluation of Second Cycle Inbred Lines of Maize (Zea Mays Linn.). PDF Download
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Author: S. A. Chavan
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: S. A. Chavan
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: Rama Dayal Singh
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 248
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Author: GANGASHETTI M. G
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Author: Bukke Kutti Bai
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
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Author: Manoj Kandel
Publisher:
ISBN: 9783668809529
Category :
Languages : en
Pages : 44
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Master's Thesis from the year 2018 in the subject Biology - Botany, grade: A, language: English, abstract: Twenty maize genotypes were tested in alpha-lattice design with two replications in research block of National Maize Research Program, Rampur, Chitwan from February to June, 2016 to evaluate maize inbred lines for their genetic components association among yield components and correlation and stress tolerance indices. Shorter ASI was found in RML-17, RML-57, RL-107, RL-140, RML-91 whereas more leaf area index in NML-2, RML-91, and RML-24 respectively. Inbred lines, RML-91, RML-17, RML-20, RL-140, RL-140, RML-91 and NML-2 were found lower tassel blast and leaf firing percentage respectively. Inbred lines, RML-76, RML-115, RML-4, RL-111 showed slower leaf senescence and RML-57, RL-101, RML-11, RL-107 showed significant higher value of SPAD chlorophyll content. Heritability and correlation analysis revealed that grain yield, number of kernel ear-1, silk receptivity, shelling percentage, thousand kernel weight plant and ear heights showed presence of additive gene effect and those traits direct could be used as direct selection to improve maize grain yield under heat stress condition. With attention to high negative correlation with anthesis silking interval, tassel blast, leaf firing with grain yield the minimum of anthesis silking interval, tassel blast and leaf firing were the most important index required further genotyping for development of thermo-tolerance lines. Cluster and PCA analysis revealed that cluster 4 genotype named as RL-140, RML-76, RML-40 and RML-91 were found to be tolerant to heat stress with higher value of grain yield and other desirable traits and lower leaf firing, Tassel blast and itermediate of anthesis-silking interval which were suitable for cultivation under heat stress condition.Based on stress tolerance indices and their correlation analysis, RML-91, RML-140 appeared as having high yield potential and low stress susceptibility u
Author: D.K. Nanda
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Author: William Anthony Feist
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ISBN:
Category :
Languages : en
Pages : 84
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Author: Ronald N. Walejko
Publisher:
ISBN:
Category :
Languages : en
Pages : 334
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To decide upon the most efficient breeding and testing procedures to improve maize populations, the plant breeder must have adequate knowledge of the type of gene action involved in yield heterosis. Two types of gene action have been postulated to account for yield heterosis in maize: dominance and overdominance. Recurrent selection of specific combining ability and for general combining ability have been proposed as methods to improve maize populations. Recurrent selection for specific combining ability uses a narow genetic base tester and originally was proposed on the assumption that overdominance is the main type of gene action responsible for yield heterosis. Conversely, selection for general combining ability uses a broad genetic base tester and assumes that dominant, favorable factors are concerned in yield heterosis. A procedure was proposed to compare the relative importance of dominance and overdominance in yield heterosis. This procedure involved recurrent relection for specific combining ability in two heterozygous source populations with a common inbred line tester. The purpose of this study was to evaluate progress in 5 cycles of recurrent slection for specific combining ability in two open-pollinated maize varieties and to determine the type of gene action involved in yield heterosis. The two source populations were the open-pollinated varieties, Kolkmeier and Lancaster, and the inbred line, Hy, was used as the common tester. After 5 cycles of recurrent selection, 6 population (C0 to C5) from (...).
Author: Gbadebo Olaoye
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Author: Abhishek Krishna
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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