Agronomical and technological performances of some early cotton cultivars planted as second crop in Diyarbakir condition, Turkey

The opportunity to increase agricultural areas is limited, so that increasing demands can be achieved by producing more products from existent agricultural areas. Second cropping is a sustainable practice in which more than one crop is grown consecutive on the same ground. This study was carried out to determine agricultural and technological properties of growing cotton (Gossypium hirsutum L.) as second crop on stubble of ridge planted wheat in Diyarbakır. The experiment was conducted in the experimental area of Dicle University Agricultural Faculty as randomize complete block design with three replications. Eight cotton varieties (Berke, Lachata, BA 119, STV 468, STV 373, Özbek 100, Fantom and DP 396) were used as material. Wheat, planting on ridge, was harvested approximately 10 cm above the soil surface June 12, 2012. Straws of harvested wheat were removed from the experimental area. Same day cotton varieties were planted two rows on each ridge. The results indicated that STV 468, Fantom and Berke in terms of seed cotton yield; Fantom, Berke in terms of fiber length; DP 396 and Berke interms of fiber strength had given the highest values. However, our study suggested that whether very earlier cotton varieties (Özbek 100, Berke and Fantom) are grown, cotton will be grown as second crop after ridge planted wheat in the stubble seedling under Diyarbakır ecological condition

QTL Mapping of Combining Ability and Heterosis of Agronomic Traits in Rice Backcross Recombinant Inbred Lines and Hybrid Crosses

BACKGROUND: Combining ability effects are very effective genetic parameters in deciding the next phase of breeding programs. Although some breeding strategies on the basis of evaluating combining ability have been utilized extensively in hybrid breeding, little is known about the genetic basis of combining ability. Combining ability is a complex trait that is controlled by polygenes. With the advent and development of molecular markers, it is feasible to evaluate the genetic bases of combining ability and heterosis of elite rice hybrids through QTL analysis. METHODOLOGY/PRINCIPAL FINDINGS: In the present study, we first developed a QTL-mapping method for dissecting combining ability and heterosis of agronomic traits. With three testcross populations and a BCRIL population in rice, biometric and QTL analyses were conducted for ten agronomic traits. The significance of general combining ability and special combining ability for most of the traits indicated the importance of both additive and non-additive effects on expression levels. A large number of additive effect QTLs associated with performance per se of BCRIL and general combining ability, and dominant effect QTLs associated with special combining ability and heterosis were identified for the ten traits. CONCLUSIONS/SIGNIFICANCE: The combining ability of agronomic traits could be analyzed by the QTL mapping method. The characteristics revealed by the QTLs for combining ability of agronomic traits were similar with those by multitudinous QTLs for agronomic traits with performance per se of BCRIL. Several QTLs (1-6 in this study) were identified for each trait for combining ability. It demonstrated that some of the QTLs were pleiotropic or linked tightly with each other. The identification of QTLs responsible for combining ability and heterosis in the present study provides valuable information for dissecting genetic basis of combining ability

Path coefficient analysis between seed cotton yield and some characters in cotton (Gossypium hirsutum L)

This study was carried out to determine direct and indirect effects of some charactrs single leaf area, leaf SPAD value, number of nods, number of sympodial branches, number of monopodial branches, single boll weight, number of bolls) on seed cotton yield. The experiment was carried out with four cotton varieties, two of which okra-leaf (Adana 98, Siokra 1/4) and two of which normal-leaf (Teks and Stoneville 453) cotton (Gossypium hirsutum L) and was conducted the randomized block design with 4 replications. In order to increase seed cotton yield In the studies of breeding program and selection orderly leaf SPAD value, number of sympodial branches, single boll weight, number of monopodial branches and number of bolls charactem determined that must be high. Results showed that in order to increase seed cotton yield in the studies of breeding program and selection the highness of leaf SPAD value, number of sympodial branches, single boll weight, number of monopodial branches and number of bolls charactem should be considered important. © Triveni Enterprises, Lucknow (India)