Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810026024
Authors: Kumari, Amba
Advisor: Singh, Vijay Kumar
Title: Heterosis for yield and its component traits in okra (Abelmoschus esculentus L. Moench)
Publisher: Department of Horticulture (Vegetable and Floriculture), BAU, Sabour
Language: en
Type: Thesis
Pages: 183
Agrotags: null
Abstract: Okra or lady's finger, (Abelmoschus esculentus L. Moench) commonly known as bhindi in India is the most popular vegetable of the family malvaceae, is an important vegetable of the tropical and subtropical region. It is an often cross pollinated vegetable with a chromosome number 2n=130 which, appears to have originated in South Africa or Asia. India is the leading producers of okra with a production of about 6346.4 thousand MT from an area of 532.7 thousand hectare having the Productivity of 11.9MT/ha. Production share of India is 72.9% and is the leading okra producing countries. Leading okra producer in India is west Bengal with production share of 14%, followed by Bihar with production share of 12 % (NHB database, 2014). In okra, a large number of varieties have been developed but substantial increase in productivity could not be realized.There is a necessary to improve the yield per unit area to achieve the increased production from a limited land. The required goal of increasing productivity in the quickest possible time can be achieved only through heterosis breeding and considered as one of the desirable, sustainable eco-friendly approach Hybrid leads to superiority in adaptability, yield, quality, diseaseresistance, maturity are generally vigorous over its parents. Generally, positive heterosis is considered as desirable. However in some cases negative heterosis is also desirable because it shows superiority over its parents. Keeping all the above facts, the present investigation was carried out at Bihar Agricultural College, Sabour during the kharif season of 2016. The design of the experiment was RBD replicated thrice with 30 genotype (7 parents, 2 standard checks & 21 F1 hybrids). Data were collected for 15 characters. The analysis of variance reveals highly significant differences among the genotypes for all the characters except internodal length which indicated that variability was present among the genotypes. In mean performance, minimum days taken to first flowering was recorded in cross Prabhani Kranti × Pusa Sawani and maximum yield per plant was recorded in Arka Abhay × Pusa Kranti.GCV was moderate for five characters while PCV was moderate for nine characters and highest fruit per plant .This means that these characters could be directly selected and least effected by the environment. High heritability estimate coupled with high genetic advance was observed for yield per plant, this means that improvement in this trait made by simple selection. In phenotypic correlation coefficient Yield was found to be positively and significantly correlated with fruit width, nodes per plant, and fruit weight. In genotypic correlation coefficient Yield was found to be positively and significantly correlated with nodes/plant, fruit width, fruit length while negatively and significantly correlated with plant height followed by days to first flowering. In phenotypic path coefficient, nodes per plant, fruit length, fruit width, revealed positive direct effect via fruit Width, nodes per plant, on yield per plant while internodal length, ascorbic acid, %, fruit weight showed negative direct effect via fruit width, nodes/plant, internodal length on yield/plant. Highest average performance along with significantly high heterosis for number of fruits per plantwas found for the cross Arka Anamika × Kashi Kranti over mid parent and better parent and cross Arka Abhay × Pusa Sawani over standard check variety while for cross Arka Abhay × Kashi Kranti observed high significant positive yield per plant over standard variety. These short listed hybrids may be tested for different traits under different agro-climatic conditions for commercial exploitation of hybrid vigour. Considering gca effect of different characters it was found that significant for all the characters except internodal length. Kashi Kranti showed negative significant gca effect for plant height. Arka Abhay and Pusa Sawani exhibited positive significant gca effect for fruit per plant. Kashi Kranti showed positive significant gca effect for nodes per plant, fruit width and yield per plant. Arka Anamika and Kashi Pragati showed negative significant gca effect for days to first flowering. Pusa Sawani showed negative significant gca effect for days to 50% flowering. Negative significant gca effect for plant height. Negative significant gca effect for plant height, days to first flowering, days to first harvesting are well exploited for further increment in yield and earliness. The sca effect of certain crosses was related with gca effects of their parent as the cross Kashi Pragati × Pusa Sawani produced significant positive sca effects in respect of average yield per plant involved at least one parent with negative and one parent gave significant negative gca effects. For number of fruits/plant in the crosses Kashi Pragati × Pusa Sawani produced significant positive sca effects involved at least one parent with non-significant negative and one parent gave significant positive gca effects.
Subject: Horticulture
Theme: Vegetable & Floriculture
These Type: M.Sc
Issue Date: 2017-07
Appears in Collections:Theses

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