A Comparative Study of Seven Methods of Measuring Earliness of Crop Maturity in Cotton<sup>1</sup>

Richmond, T. R.; Radwan, Sami R. H.

doi:10.2135/cropsci1962.0011183x000200050010x

Cited by 37 publications

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“…Earliness, a distinctive characteristic of short-season cotton, is a complex agronomic trait of a quantitative genetic nature [3]. In terms of plant development, earliness may be described in reference to budding date, flowering timing (FT) and the whole growth period (WGP) [4]. Other agronomic traits, such as plant height (PH), node of the first fruiting branch (NFFB) and height of the NFFB (HNFFB), have also been used as earliness indexes [5, 6].…”

Section: Introductionmentioning

confidence: 99%

High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L

et al. 2016

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Background Gossypium hirsutum L., or upland cotton, is an important renewable resource for textile fiber. To enhance understanding of the genetic basis of cotton earliness, we constructed an intra-specific recombinant inbred line population (RIL) containing 137 lines, and performed linkage map construction and quantitative trait locus (QTL) mapping.ResultsUsing restriction-site associated DNA sequencing, a genetic map composed of 6,434 loci, including 6,295 single nucleotide polymorphisms and 139 simple sequence repeat loci, was developed from RIL population. This map spanned 4,071.98 cM, with an average distance of 0.63 cM between adjacent markers. A total of 247 QTLs for six earliness-related traits were detected in 6 consecutive years. In addition, 55 QTL coincidence regions representing more than 60 % of total QTLs were found on 22 chromosomes, which indicated that several earliness-related traits might be simultaneously improved. Fine-mapping of a 2-Mb region on chromosome D3 associated with five stable QTLs between Marker25958 and Marker25963 revealed that lines containing alleles derived from CCRI36 in this region exhibited smaller phenotypes and earlier maturity. One candidate gene (EMF2) was predicted and validated by quantitative real-time PCR in early-, medium- and late-maturing cultivars from 3- to 6-leaf stages, with highest expression level in early-maturing cultivar, CCRI74, lowest expression level in late-maturing cultivar, Bomian1.ConclusionsWe developed an SNP-based genetic map, and this map is the first high-density genetic map for short-season cotton and has the potential to provide deeper insights into earliness. Cotton earliness-related QTLs and QTL coincidence regions will provide useful materials for QTL fine mapping, gene positional cloning and MAS. And the gene, EMF2, is promising for further study.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-016-3269-y) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L

et al. 2016

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“…Rauf et al (2005) reported that importance of additive gene action for number and heigth of node first fruiting branch. The earlier studies of earliness in cotton number of node first sympodial branch, date of first square and date of first flower (Richmond and Radwan 1962), harvested rate of first picking (Richmond and Ray 1966), number of node first sympodial branch and date of first flower (Munro 1971), number of node first sympodial branch and harvested rate of first picking (Tiffany and Nalm 1981), number of node first sympodial branch, date of first square, date of first flower and harvested rate of first picking (Godoy 1994; Godoy and Palomo 1999), number of node first sympodial branch (Iqbal et al 2003) were found reliable for estimation of earliness of cotton plant. They reported that these earliness characters may use efficiently in selections of early genotypes.…”

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Combining ability and heterosis for earliness characters in line×tester population of Gossypium hirsutum L.

Başbağ

Ekinci²,

Gençer

2007

Hereditas

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The objective of this study was to estimate the general combining ability of the parents and specific combining ability of hybrids for earliness traits for line selection. Inheritance and interrelationships of earliness characters were evaluated in a line x tester design. Three intermediate-early-maturing female (lines) which are grown regionally and four early-maturing males (testers) cotton varieties were crossed in 2003. The twelve F(1) and seven parents were planted randomized block design with three replications in 2004. For each earliness trait, general combining ability (GCA) and specific combining ability and gene effects were estimated using the line x tester method of analysis and also were determined heterosis and narrow sense heritability. Parents and their hybrids (except the monopodial branch) were significant for all the earliness traits studied. Estimates of variance due to GCA and SCA and their ratio revealed predominantly non-additive gene effects for date of first square, date of first flowers and harvested rate of first picking. Among the lines, Ersan 92 and Maras 92 and among the testers Acala Royal was found to be the best general combiners for most of the earliness characters. Four out of twelve crosses namely Ersan 92 x Chirpan 603, Ersan 92 x Acala Maxa, Maras 92 x Acala Royal and Nazilli 87 x Acala Royal were found to be the best crosses for investigated earliness characters.

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“…In China, the cotton‐planting regions have been divided into several agro‐ecological zones based on temperature, photoperiod, frost date and other climatic factors, all of which require early‐maturing cotton varieties (Yu and Xia 2003). Previous research has shown that early maturity in cotton was related to morphological and developmental variables (Richmond and Radwan 1962, Godoy and Palomo 1999). However, the efficiency with which these factors can be manipulated depends considerably on understanding the inheritance and interrelationships among the determinants of early maturity.…”

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Inheritance of time of flowering in upland cotton under natural conditions

Hao

et al. 2008

Plant Breeding

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Time to flowering is an essential component of the adaptation and productivity of cotton (Gossipium hirsutum) in various agro-ecological zones. This article presents a study of the genetic control of this trait in two crosses obtained from different early-maturity parental lines. In each cross, multiple generations including P 1 , F 1 , P 2 , B 1 , B 2 and F 2 were evaluated under two natural field conditions in 2004 and 2005. The data on time to flowering in the F 2 populations had a continuous distribution but deviated from normality. A joint segregation analysis (JSA) revealed that time of flowering in upland cotton was controlled by a mixture of an additive major gene and additive-dominant polygenes. The first-and second-order genetic parameters were all calculated based on the mixture of major gene and polygene inheritance models using JSA. These results suggested that there was considerable genetic diversity and complexity in days to anthesis in upland cotton. This variation can be used to formulate the most efficient breeding strategy and to design cotton for a particular environment.

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A Comparative Study of Seven Methods of Measuring Earliness of Crop Maturity in Cotton¹

Abstract: REVIEW OF LITERATURE Extensive studies on the growth pattern of the cotton plant and the characteristics of the different varieties that condition early maturity have been reported by Ewing (3), Martin et al. (8), Harland (5), McNamara et al.

Cited by 37 publications

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High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L

High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L

Combining ability and heterosis for earliness characters in line×tester population of Gossypium hirsutum L.

Inheritance of time of flowering in upland cotton under natural conditions

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A Comparative Study of Seven Methods of Measuring Earliness of Crop Maturity in Cotton1

Abstract: REVIEW OF LITERATURE Extensive studies on the growth pattern of the cotton plant and the characteristics of the different varieties that condition early maturity have been reported by Ewing (3), Martin et al. (8), Harland (5), McNamara et al.

Cited by 37 publications

References 0 publications

High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L

High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L

Combining ability and heterosis for earliness characters in line×tester population of Gossypium hirsutum L.

Inheritance of time of flowering in upland cotton under natural conditions

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A Comparative Study of Seven Methods of Measuring Earliness of Crop Maturity in Cotton¹