Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality

In Malaysia, sweetpotato has a good potential to be an important crop but currently it is not fully utilized. The leafy tops are sold in the market as vegetable, but the varieties sold are varied especially in eating quality. The objectives of this study were to evaluate the genetic diversity of le...

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Main Author:	Devarajan, Thiyagu
Format:	Thesis
Language:	English
Published:	2012
Subjects:	Sweet potatoes Sweet potatoes - Genetics Sweet potatoes
Online Access:	http://psasir.upm.edu.my/id/eprint/32279/1/FP%202012%2037R.pdf
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id	my-upm-ir.32279
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spelling	my-upm-ir.322792015-01-08T01:58:44Z Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality 2012-04 Devarajan, Thiyagu In Malaysia, sweetpotato has a good potential to be an important crop but currently it is not fully utilized. The leafy tops are sold in the market as vegetable, but the varieties sold are varied especially in eating quality. The objectives of this study were to evaluate the genetic diversity of leaf characters and yield components of selected twenty-two out of hundred fifty sweetpotato genotypes available in Malaysian Agriculture Research Development Institute (MARDI)’s sweetpotato germplasm collected from throughout Malaysia and other countries, subsequently to identify potential genotypes grown across different types of agro-ecology for vegetable use. In the first experiment, twenty sweetpotato genotypes were selected from MARDI’s germplasm collection and another 2 genotypes obtained from wet market, Serdang, Selangor, and were evaluated in MARDI Research Station, Serdang. The genotypes were planted with three replications on three-bed plots using randomized complete block design. The planting distance was 50 cm between bed and 25 cm within planting rows, and 20 of 30 cm shoot cuttings were used as planting materials. Results showed, morphological, yield and yield component traits were highly variable. Heritability estimates accounted for more than 80% in all traits except latex, hairiness, mature leaf size (cm) and leaf number per 10 cm shoot. In most traits a large portion of the phenotypic variance was accounted for by the genetic component. MIB12 recorded high total shoot yield (kg bed-1) followed by MIB05. Meanwhile, MIB17 had the largest leaf area (cm2), while MIB09 with the smallest. For the overall consumer acceptability score in organoleptic test, MIB05 was chosen as highly preferred genotype followed by MIB14, MIB13 and MIB15. In the second experiment, six selected genotypes from the first experiment namely, MIB05, MIB12, MIB13, MIB14, MIB15 and MIB20 were evaluated infour locations over two planting seasons. The six genotypes were selected based on shoot yield, low latex exudation, root yield and organoleptic characters. The trials were conducted at four locations, namely Serdang, Selangor (mineral soils), Telong, Kelantan (bris soils), Kundang, Selangor (tin-tailing soils) and Pontian, Johor (peat soils) with four replications using randomized complete block design in each agro-ecology. MIB05 had high total shoot yield in all agro-ecologies except in Pontian. Although MIB05 produced high shoot yield it had low or no root yields. The genotype stability analysis indicates that MIB15 was either stable or highly stable in all agroecologies in most characters using genotype-grouping techniques, nonparametric (S3i) and superiority measure (Pi) statistics. In this study, leaf area (cm2), petiole length (cm) and 30-shoots weight (kg) exhibited genotypic coeffient variation (GCV) and phenotypic coefficient variation (PCV) more than 20% and heritability more than 40% at all agro-ecologies suggesting that these characters would be very useful as a base for selection in sweetpotato breeding programs. Finally this study suggests that MIB15 is highly recommended for leafy vegetable and root production across agroecologies. Meanwhile MIB05 is recommended for shoot yield production especially for planting on bris soils. Sweet potatoes Sweet potatoes - Genetics Germplasm resources, Plant 2012-04 Thesis http://psasir.upm.edu.my/id/eprint/32279/ http://psasir.upm.edu.my/id/eprint/32279/1/FP%202012%2037R.pdf application/pdf en public masters Universiti Putra Malaysia Sweet potatoes Sweet potatoes - Genetics Germplasm resources, Plant
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Sweet potatoes Sweet potatoes - Genetics Sweet potatoes
spellingShingle	Sweet potatoes Sweet potatoes - Genetics Sweet potatoes Devarajan, Thiyagu Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality
description	In Malaysia, sweetpotato has a good potential to be an important crop but currently it is not fully utilized. The leafy tops are sold in the market as vegetable, but the varieties sold are varied especially in eating quality. The objectives of this study were to evaluate the genetic diversity of leaf characters and yield components of selected twenty-two out of hundred fifty sweetpotato genotypes available in Malaysian Agriculture Research Development Institute (MARDI)’s sweetpotato germplasm collected from throughout Malaysia and other countries, subsequently to identify potential genotypes grown across different types of agro-ecology for vegetable use. In the first experiment, twenty sweetpotato genotypes were selected from MARDI’s germplasm collection and another 2 genotypes obtained from wet market, Serdang, Selangor, and were evaluated in MARDI Research Station, Serdang. The genotypes were planted with three replications on three-bed plots using randomized complete block design. The planting distance was 50 cm between bed and 25 cm within planting rows, and 20 of 30 cm shoot cuttings were used as planting materials. Results showed, morphological, yield and yield component traits were highly variable. Heritability estimates accounted for more than 80% in all traits except latex, hairiness, mature leaf size (cm) and leaf number per 10 cm shoot. In most traits a large portion of the phenotypic variance was accounted for by the genetic component. MIB12 recorded high total shoot yield (kg bed-1) followed by MIB05. Meanwhile, MIB17 had the largest leaf area (cm2), while MIB09 with the smallest. For the overall consumer acceptability score in organoleptic test, MIB05 was chosen as highly preferred genotype followed by MIB14, MIB13 and MIB15. In the second experiment, six selected genotypes from the first experiment namely, MIB05, MIB12, MIB13, MIB14, MIB15 and MIB20 were evaluated infour locations over two planting seasons. The six genotypes were selected based on shoot yield, low latex exudation, root yield and organoleptic characters. The trials were conducted at four locations, namely Serdang, Selangor (mineral soils), Telong, Kelantan (bris soils), Kundang, Selangor (tin-tailing soils) and Pontian, Johor (peat soils) with four replications using randomized complete block design in each agro-ecology. MIB05 had high total shoot yield in all agro-ecologies except in Pontian. Although MIB05 produced high shoot yield it had low or no root yields. The genotype stability analysis indicates that MIB15 was either stable or highly stable in all agroecologies in most characters using genotype-grouping techniques, nonparametric (S3i) and superiority measure (Pi) statistics. In this study, leaf area (cm2), petiole length (cm) and 30-shoots weight (kg) exhibited genotypic coeffient variation (GCV) and phenotypic coefficient variation (PCV) more than 20% and heritability more than 40% at all agro-ecologies suggesting that these characters would be very useful as a base for selection in sweetpotato breeding programs. Finally this study suggests that MIB15 is highly recommended for leafy vegetable and root production across agroecologies. Meanwhile MIB05 is recommended for shoot yield production especially for planting on bris soils.
format	Thesis
qualification_level	Master's degree
author	Devarajan, Thiyagu
author_facet	Devarajan, Thiyagu
author_sort	Devarajan, Thiyagu
title	Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality
title_short	Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality
title_full	Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality
title_fullStr	Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality
title_full_unstemmed	Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality
title_sort	genetic diversity and stability analysis of sweetpotato (ipomoea batatas lam. l.) germplasm for leafy vegetable quality
granting_institution	Universiti Putra Malaysia
publishDate	2012
url	http://psasir.upm.edu.my/id/eprint/32279/1/FP%202012%2037R.pdf
_version_	1747811659464835072

Genetic diversity and stability analysis of sweetpotato (Ipomoea batatas Lam. L.) germplasm for leafy vegetable quality

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