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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Correlation and Heritability for Yield and Fiber Quality Parametersof Ethiopian Cotton (Gossypium hirsutum L.) Estimated from 15(diallel) Crosses) ผู้เขียน: Zerihun Desalegn,  ดร.งามชื่น รัตนดิลก, รองศาสตราจารย์ , ดร.รังสฤษดิ์ กาวีต๊ะ, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractCorrelation and heritability estimates of the yield and the fiber or lint quality were determined using 15 F1 cotton hybrids obtained from a diallel cross made in the Werer Agricultural Research Center, in Ethiopia, in 2003. The results indicated that the seed cotton yield was highly genetically correlated to boll weight (r = 0.99**), lint yield (r = 0.88**) and lint index (r = 0.96**). The lint yield was highly correlated to lint percentage (r = 0.94**) and the number of seeds per boll (r = 0.96**). The results illustrated that a high lint percentage, more bolls per plant and a small seed size were positively correlated to high cotton lint yield. Fiber strength was highly correlated to all fiber quality parameters and positive correlations were found between staple length 2.5% (r = 0.99**) staple length 50% (r = 0.64**) and fiber strength. A positive correlation was also found between the fineness indicator (micronaire) and the uniformity ratio (r = 0.61**). However negative correlations were observed between fiber length and the fineness indicator (micronaire) (r = -0.86**), short fiber index (r = -0.85**) and uniformity ratio (r = -0.99**). Negative genetic correlation coefficients of lint percentage and lint yield with fiber strength were quite high (r = -0.99 and r = -0.96**, respectively), but they had a positive correlation with the fiber-fineness indicator or micronaire (r = 0.99** and 0.79**, respectively). The broad-sense heritability estimates of the yield and yield components were high for lint percentage (h2 = 97%), lint yield (h2 = 72%), lint index (h2 = 79%) and seed index (h2 = 86%). As they also had a strong relationship with other fiber quality parameters as well, they could be considered as indicators of the yield and fiber quality improvement in cotton. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Evaluation of F1 and F2 Generations for Yield and Yield Components and Fiber Quality Parameters on Cotton (Gossypium hirsutum L.) Under Werer, Ethiopia Condition) ผู้เขียน:Zerihun Desalegn, ดร.งามชื่น รัตนดิลก, รองศาสตราจารย์, ดร.รังสฤษดิ์ กาวีต๊ะ, รองศาสตราจารย์, นายประดิษฐ์ พงศ์ทองคำ, ศาสตราจารย์เกียรติคุณ, Ananchai Kuantham สื่อสิ่งพิมพ์:pdf AbstractDue to the difficulty of producing F1 hybrid seed, the use of heterosis in cotton (Gossypium hirsutum L.) has been limited. This study was conducted on fifteen F1, fifteen F2 and 6 parental genotypes obtained from partial diallel cross of 6 varieties with the objectives of comparing the parents, F1 and F2 generations and to identify the competitive potential of F2 hybrids over the best yielding cultivars for yield component and fiber quality parameters. It was evident to find the seedcotton and lint yield superiority of F1 hybrid over parents and F2 generations. F1 hybrids showed an overall seedcotton yield advantage of F1 over the parental means of 26.4 %, while F2 hybrids were 9.3%. Best F1 hybrids showed 19.5% yield advantage over the best check parent, while best F2 hybrids were only 2.5%. Almost the same pattern was observed for lint yield with the level of heterosis at 28.6, 10.2, 30.4 and 0.8 % for F1 and F2 mid-parent and best parent, respectively. Significant differences were not observed for fiber quality parameters except fiber strength. The result of this study demonstrated the potential of F1 rather than F2 hybrids and the need for further investigation on heterosis and inbreeding depression and development of economically feasible hybrid seed production technology. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Heterosis and Combining Ability for Yield and Yield Components
of Cotton (Gossypium hirsutum L.)) ผู้เขียน:Zerihun Desalegn, ดร.งามชื่น รัตนดิลก, รองศาสตราจารย์, ดร.รังสฤษดิ์ กาวีต๊ะ, รองศาสตราจารย์, นายประดิษฐ์ พงศ์ทองคำ, ศาสตราจารย์เกียรติคุณ, Ananchai Kuantham สื่อสิ่งพิมพ์:pdf AbstractHeterosis and combining ability for yield and yield components were determined in a population
derived from half diallel crossing of six cotton genotypes. Heterosis and heterobeltiosis occurred in
varying degrees. The highest heterosis for lint yield was 66.4 % and for seedcotton yield was 46.3 %. Five
of fifteen crosses showed significant heterobeltiosis for seedcotton yield. Significant heterobeltiosis was
predicted for crosses of GL-7 X Cucurova1518 and Del Cerro X Cucurova1518 for seedcotton yield,
which resulted in 19.5 and 19.0 %, respectively. The analysis of variance to compare between parents
and F1 crosses showed that the mean squares of genotypes and general combining ability (GCA) were
significant (P<0.01) for all traits studied. However, the mean square of specific combining ability (SCA)
was significant only for lint percentage and seed index. The magnitude of GCA was higher than SCA in
all cases, indicating that additive gene action was more important than non-additive in the inheritance of
the traits. In this study, Cucurova 1518 and GL-7 were good combiners for yield and yield components.
The two best crosses for seedcotton yield were GL-7 X Cucurova1518 and Del Cerro X Cucurova1518.
Best parents and best crosses could be used to develop high yield breeding materials. |
Researcherดร. รังสฤษดิ์ กาวีต๊ะ, รองศาสตราจารย์ที่ทำงาน:ภาควิชาพืชไร่นา คณะเกษตร สาขาที่สนใจ:การปรับปรุงพันธุ์พืช, สถิติและพันธุศาสตร์ปริมาณที่ใช้ในการปรับปรุงพันธุ์พืช, การใช้ที่ดินและทรัพยากรธรรมชาติอย่างยั่งยืน Resume |