Intra-varietal variability and response to single plant selection in<i>Gossypium hirsutum</i>L.: II. Genotypic variability

Thomson, NJ

doi:10.1017/s0021859600057166

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…Lint yield had a heritability of 0.56, toward the high end of the literature range of 0 to 0.6 (Manning, 1954; Al‐Jibouri et al, 1958; Murray and Verhalen, 1969; Thomson, 1973). Heritability estimates for fiber quality and lint percentage traits ranged from 0.68 for length uniformity to 0.98 for fiber extension and lint percentage (Table 5).…”

Section: Resultsmentioning

confidence: 98%

“…Medium to high heritabilities have generally been reported for lint percentage and fiber traits. Heritabilities for fiber length range from 0.7 to 0.9, fiber strength 0.6 to 0.9 (Stith, 1956; Al‐Jibouri et al, 1958; Miller et al, 1958; Murray and Verhalen, 1969) and micronaire reading 0.4 to 0.5 (Murray and Verhalen, 1969; Thomson, 1973). May (1999) reviewed the genetic variation in fiber quality and concluded that selection for most parameters in a breeding program should be effective.…”

Section: Resultsmentioning

confidence: 99%

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Selection for Water Use Efficiency Traits in a Cotton Breeding Program: Cultivar Differences

et al. 2005

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these requirements (Stiller et al., 2004), and those with the okra leaf trait have also been successful (Stiller et al., Water stress adversely affects both yield and fiber quality of cotton 2004;Thomson, 1994).(Gossypium hirsutum L.) and any improvement in components of water use efficiency (WUE) would be expected to partially reduce Physiological traits associated with water use effithese adverse affects. Six field experiments in Australia and one in ciency or stress tolerance have rarely been used in plant Texas using four Australian and three Texas cultivars determined breeding. This is due to difficulties associated with meagenetic differences in physiological WUE parameters. Four of the exsuring these traits on large numbers of plants, low heritaperiments were grown under dryland conditions and three under irbilities, and complex relationships between these traits rigated conditions. Cultivar differences for net photosynthesis (A ) and yield (Hall et al., 1994). However, the demonstrawere found in only 30% of comparisons, ratio of intercellular CO 2 tion that carbon isotope discrimination (⌬) could proconcentration to ambient CO 2 concentration (C i /C a ) in 20%, and carvide an indirect measure of plant transpiration efficiency bon isotope 13 C discrimination (⌬) in 69%. Cultivars Cascot 014 and (Farquhar et al., 1982; Farquhar and Richards, 1984) Sicot 189 had significantly (P Յ 0.05) higher A than Siokra 1-4 and has renewed interest in breeding for physiological water Siokra L23 and these differences were consistent across experiments. A significant (P Յ 0.05) cultivar ϫ experiment interaction suggests use efficiency. Discrimination against 13 CO 2 in favor of C i /C a would be an environment specific measure enabling confident 12 CO 2 during CO 2 diffusion through the stomata and durdistinction of cultivar differences. Tamcot Sphinx and Cascot 014 had ing photosynthesis in C 3 plants is closely related to the significantly higher ⌬ (P Յ 0.001) than Siokra L23, with the ranking transpiration efficiency integrated over the life of the differing in only one irrigated experiment. Broad sense heritability plant material sampled (Farquhar and Richards, 1984; estimates were 0.65, 0.68, and 0.56 for A, ⌬, and lint yield, respectively. Condon et al., 1992). In recent times, selection for ⌬ Cultivar variation for these physiological traits measured in single in early generation progeny has increased the yield of leaves of cotton, and related indirectly to plant WUE, indicate potenwheat (Triticum aestivum L.) grown under dryland contial for genetic advancement through selection. Further studies to deditions (Rebetzke et al., 2002) and led to the subsequent termine heritability of these physiological traits in segregating popurelease of a new cultivar (Anon., 2002). lations are needed to confirm their usefulness in a cotton-breeding program.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Selection for Water Use Efficiency Traits in a Cotton Breeding Program: Cultivar Differences

et al. 2005

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“…Expected response for lint yield was calculated by the formula set out in the second paper (Thomson, 19736) while correlated responses of other attributes were estimated by the equation CR VX = iH^r^SDy (Falconer,I960,p. 318),…”

Section: Methodsmentioning

confidence: 99%

“…where CR VX is the expected response of character Y when selection is applied to another character X; i is the selection differential associated with selection for X; H x is heritability of character X; H v is heritability of character Y; r xy is the genotypic correlation between X and Y; and SD V is the phenotypic standard deviation of character Y. The selection differential was estimated from the difference between the population and selection mean, and the heritabilities were those estimated previously (Thomson, 19736). Actual responses with lint yield and the closely associated component traits, seed cotton yield and boll number, were considerably greater than expected but responses in boll weight, lint percentage, and mature height were close to expectations.…”

Section: Methodsmentioning

confidence: 99%

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Intra-varietal variability and response to single plant selection in Gossypium hirsutum L.: III. Response to selection

Thomson

1973

J. Agric. Sci.

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Response to selection primarily for lint yield among spaced plant populations of four American and one African variety of Gossypium hirsutum L., established in 1965-6 at Kimberley Research Station, was studied in three experiments conducted between 1966 In the first experiment, in which single-hill micro-plots of 3-5 plants per hill were used, the mean lint yield of progenies was larger than predicted from single plant heritabilities. In the second experiment, in which single-row plots were used, response to selection for lint yield was generally less than expected. In the third experiment, in which three-row plots were used, response to selection for lint yield was again less than expected and less than manifested in the second experiment. However, in all experiments responses to selection for lint percentage, lint quality properties, and height were close to expectations while some individual progenies substantially out-yielded their unselected parents.The progressive decline in response to selection for lint yield from the first to the third experiment, and the discrepancies between the actual responses and the expected responses for lint yield in all experiments, were interpreted mainly on a basis of intergenotypic competitive effects differing in sympathy with plot size and plant disposition.It was concluded that the objective methods of selection practised were successful when judged on plant breeding criteria. It was also concluded that intra-varietal selection is an important technique by -which genetic improvement can be achieved at regional breeding centres with limited resources.

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Colchicine mutagenesis is associated with substantial heritable variation in cotton

Luckett

1989

Euphytica

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Seedlings of the cotton cultivar Sicot 1 were treated with either 1%, 2% or 5% colchicine in lanolin which was topically applied to the apical meristem four days after emergence . Of 293 1%-treated seedlings 64 survived to produce fertile C, shoots which gave rise to 84 C2 single boll families . C2 and C3 generations were examined in field experiments for morphological variants and for a number of quantitative characters (yield components and fibre quality) . No morphological mutants were seen but considerable heritable variation for metrical characters of economic importance was detected . Of 18 extreme C2 families consisting of 54 C3 progenies, 19 were shown in a replicated spaced-plant trial to be significantly different to the Sicot 1 parental material for at least one (usually more) characters . The 222 C3 progenies of the 66 non-extreme C2 families were tested in an unreplicated plot experiment and at least 14 were suspected of exhibiting variation in metrical characters . Although no light has been shed on the mechanism responsible for the production of variants by this method, it is argued that the colchicine technique results in higher levels of genetic variation than found in commercial cultivars ; variation which can be readily exploited by cotton breeders .

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Intra-varietal variability and response to single plant selection inGossypium hirsutumL.: II. Genotypic variability

Cited by 6 publications

References 19 publications

Selection for Water Use Efficiency Traits in a Cotton Breeding Program: Cultivar Differences

Selection for Water Use Efficiency Traits in a Cotton Breeding Program: Cultivar Differences

Intra-varietal variability and response to single plant selection in Gossypium hirsutum L.: III. Response to selection

Colchicine mutagenesis is associated with substantial heritable variation in cotton

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