SPAD readings and associated leaf traits in durum wheat, barley and triticale cultivars
SPAD readings and associated leaf traits in durum wheat, barley and triticale cultivars
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DOI：
10.1023/a:1015878719389
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发表时间：
2002-01-01
期刊：
影响因子：
1.9
通讯作者：
Deidda, M
中科院分区：
文献类型：
--
作者：
Giunta, F;Motzo, R;Deidda, M
SPAD读数可以代表一个有用的筛选标准，旨在增加叶片光合作用的速率和持续时间的育种计划。在意大利撒丁岛的两个试验站对17个硬粒小麦品种、8个小黑麦品种和18个大麦品种进行了两年的试验，以评估SPAD读数的遗传变异的存在，并量化SPAD读数、叶片面积（LA）、比叶面积（SLA）、分蘖开始至剑叶出现期间的叶片氮浓度（LNC）和单位叶面积氮（LN）。植物在足够的氮肥下生长。大麦的SPAD阅读平均值比硬粒小麦和小黑麦低9-10个单位。组合方差分析表明，在所有三个物种，与SPAD读数的基因型与环境的相互作用方差低于遗传方差。在硬粒小麦和大麦，SPAD读数表现出较大的遗传变异相比，LNC，LN和SLA。在硬粒小麦和小黑麦中，SPAD读数与LN和SLA具有遗传相关性。硬粒小麦与小黑麦不同，因为其SLA的遗传变异与LA无关。基于SPAD读数和LA值的筛选应确定具有良好光合机制的品系，其与每叶片低面积无关。
SPAD readings may represent a useful screening criterion in breeding programs aimed at increasing the rate and duration of leaf photosynthesis. A two-year trial was conducted on 17 cultivars of durum wheat, 8 of triticale and 18 of barley at two experiment stations in Sardinia, Italy, to evaluate the existence of genetic variation for SPAD readings, and to quantify the genetic associations between SPAD readings, area per leaf blade (LA), specific leaf area (SLA), leaf nitrogen concentration (LNC) and leaf nitrogen per unit of leaf surface (LN) in the period between beginning of tillering and flag leaf appearance. Plants were grown at sufficient nitrogen fertilization. The average SPAD reading of barley was 9-10 units lower than that of durum wheat and triticale. The combined ANOVA indicated that, in all the three species, the genotype by environment interaction variance associated with SPAD readings was lower than the genetic variance. In durum wheat and barley, SPAD readings exhibited a greater genetic variance in comparison with LNC, LN and SLA. In durum wheat and triticale, SPAD readings were genetically correlated with LN and SLA. Durum wheat differed from triticale because its genetic variation in SLA was not associated with LA. A screening based on both SPAD readings and LA values should identify lines with good photosynthetic machinery that is not associated with low area per leaf blade.