|Author:||Saint Pierre, Carolina ; Reynolds, Matthew ; Trethowan,Richard|
|Book Group Author:||NA|
A study of 36 wheat (Triticum aestivum L.) genotypes with different levels of stem solidness was conducted to assess the heritability and relationship among stem morphological properties, stem water-soluble carbohydrates (WSC) storage capacity and grain yield. The total amount of pith-fill in the upper stem internode (VOL) was highly correlated with the total content of WSC per stem under both water deficit (DEF) (r=0.56) and well irrigated conditions (IRR) (r=0.49). A positive correlation was also found between VOL and grain yield under DEF (r=0.49), which was explained by the positive contribution of WSC to grain yield. A closer association of grain yield and morphological traits was identified under DEF than under IRR. The closer associations found among estimations of %WSC and WSC-area and grain yield under DEF indicate that these variables may be adaptive rather than constitutive traits. High heritability values (0.77-0.84) observed for stem morphological traits reinforce their potential use in breeding for high WSC and ultimately, higher grain yield under water-limited environments. Stem length, diameter and solidness could be combined in an ideal plant ideotype to maximise WSC reserves as a strategy to improve yield under water-limited conditions.
|Pages:||166 - 174|
|Journal:||Functional plant biology FPB|
genetic improvement, heritability, progeny testing, cropyield, crop management, plant breeding, genotype, cultivars, geneticvariation, irrigation management, plant morphology, high-yieldingvarieties, drought tolerance, stems, length, Triticum aestivum, wheat,water stress, carbohydrates, soluble solids, quantitative analysis,diameter, firmness, chemical constituents of plants, Mexico