Factors affecting the grain yield predicting attributes of spectral reflectance indices in durum wheat: growing conditions, genotype variability and date of measurement
Factors affecting the grain yield predicting attributes of spectral reflectance indices in durum wheat: growing conditions, genotype variability and date of measurement
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DOI：
10.1080/01431160512331337808
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发表时间：
2005-06-10
影响因子：
3.4
通讯作者：
Araus, JL
中科院分区：
文献类型：
--
作者：
Bort, J;Casadesus, J;Araus, JL
研究了描述生物量及其生理状态的光谱反射指数的变异来源(环境、基因型和测量日期)，以及它们在提供准确和非破坏性的作物物候和产量估计方面的潜在用途，这些变异来自于几个表现出适应不同地中海环境的硬粒小麦基因型。对灌浆过程中的光谱反射率进行了测量。所有光谱指数和粮食产量都显示出不同环境在水分有效性方面的显著差异。当比较湿润和干燥的地点时，光合作用面积指数和衰老指数分别是所有品种的生物量和物候的良好指标。当在地中海条件下春播试验提供的高温条件下种植植物加速作物发育时，所有光谱指标在灌浆一周内都显示出显著的变化，反映了作物物候的变化和衰老的开始。报道的籽粒产量与某些反射指数之间的相关系数在不同类型之间的数值甚至符号的变化，可能反映了在灌浆后期对高温和干旱的反应(通过避免)的基因型差异。如果测量日期选择得当，光谱反射数据可能有助于了解硬粒小麦冠层的物候特征，如作物持续时间。
The sources of variation (environment, genotype and date of measurement) of spectral reflectance indices describing biomass and its physiological status, and their potential use for providing accurate and non-destructive estimates of crop phenology and yield, were studied on canopies of several collections of durum wheat genotypes showing adaptation to different Mediterranean environments. Spectral reflectance was measured during grain filling. All spectral indices and grain yields showed significant differences between contrasting environments in terms of water availability. Photosynthetic area indices and senescence indices were good indicators, for all genotype collections, of biomass and phenology, respectively, when comparing a wetter site with a drier site. When crop development was accelerated by growing plants under high temperature, provided by a spring-sown trial under Mediterranean conditions, all spectral indices showed significant variation within a period of one week through grain filling, reflecting the changes in crop phenology and the onset of senescence. The reported changes in the values, and even the signs, of the correlation coefficients across genotypes between grain yield and some reflectance indices might reflect genotypic differences in response (by avoidance) to high temperature and drought during late grain filling. Spectral reflectance data may help to understand phenological characteristics of durum wheat canopies, such as crop duration, provided the date of measurement is well chosen.