CARBON ISOTOPE DISCRIMINATION IS POSITIVELY CORRELATED WITH GRAIN-YIELD AND DRY-MATTER PRODUCTION IN FIELD-GROWN WHEAT
CARBON ISOTOPE DISCRIMINATION IS POSITIVELY CORRELATED WITH GRAIN-YIELD AND DRY-MATTER PRODUCTION IN FIELD-GROWN WHEAT
复制标题
DOI：
10.2135/cropsci1987.0011183x002700050035x
复制
发表时间：
1987-09-01
期刊：
影响因子：
2.3
通讯作者：
FARQUHAR, GD
中科院分区：
文献类型：
--
作者：
CONDON, AG;RICHARDS, RA;FARQUHAR, GD
碳同位素鉴别（Δ）是细胞间二氧化碳分压和大气分压比值的量度。Δ的变化在一些C3物种中，包括小麦（Triticum aestivum L.），最近与生长在温室中的干旱植物的水分利用效率的变化相关。本研究的目的是评估在三个地点生长的较大小麦基因型组中的基因型变异，并确定田间生长植物的产量与Δ T之间的关系。那时水不是生长的限制24个面包小麦基因型、1个硬粒小麦（Triticum turgidum L.）durum）和2个小黑麦基因型（x Triticosecale rimpaui Wittm.）1984年，在澳大利亚新南威尔士州南部的两个地点重复种植。生长季节的降雨量高于平均水平，尤其是在开花前。对每个地块的茎材料测量碳同位素区分。最终地上生物产量和籽粒产量也进行了测定。在Δ中存在大量的基因型变异。Δ的基因型排序是一致的跨领域网站之间的领域生长的植物和植物生长在盆在另一个位置。Δ的变化的潜在来源是：是气孔导度的变化。对于盆栽植物，Δ叶片总电导率较差。然而，Δ与叶背表面电导率呈显著正相关。在非限制水分的田间条件下，生物产量和籽粒产量均与Δ成正相关。后一结果表明碳同位素鉴别可用于选择小麦增产。
Carbon isotope discrimination (.DELTA.) is a measure of the ration of the intercellular and atmospheric partial pressures of CO2. Variation in .DELTA. within some C3 species, including wheat (Triticum aestivum L.), has recently been correlated with variation in water use efficiency of droughted plants grown in the glasshouse. The objectives of this study were to assess genotypic variation in a larger group of wheat genotypes grown at three locations, and to determine the relationship between yield of field-grown plants and .DELTA. when water was not a limitation to growth. Twenty-four bread wheat genotypes, one durum (Triticum turgidum L. durum), and two triticale genotypes (x Triticosecale rimpaui Wittm.) were grown in replicated plots at two locations in southern New South Wales, Australia, in 1984. The growing season had above average rainfall, especially in the period preceding anthesis. Carbon isotope discrimination was measured on stem material for each plot. Final aboveground biological yield and grain yield were also measured. There was substantial genotypic variation in .DELTA.. Genotypic ranking for .DELTA. was consistent across field sites and between field-grown plants and plants grown in pots at another location. A potential source of variation in .DELTA. is variation in stomatal conductance. For pot-grown plants, the relationship between .DELTA. and total leaf conductance was poor. However, .DELTA. and conductance of the abaxial leaf surface were positively correlated. Under field conditions of nonlimiting water, biological yield and grain yield were both positively correlated with .DELTA.. This latter result indicates that carbon isotope discrimination may be used to select for icreased yield in wheat.