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为研究利用碳同位素分辨率(Δ13C)作为小麦高产节水品种鉴定指标的可靠性,筛选最佳测定器官,以20个西北地区小麦地方品种和育成品种(系)为试验材料,在宁夏地区有限灌溉条件和雨养条件下,于2006—2008年连续3年测定分析了各品种旗叶和籽粒、2年测定分析了基部茎秆的碳同位素分辨率(Δ13C值)及其与产量的相关性。结果显示:有限灌溉条件下,旗叶的Δ13C与产量的相关性只有2008年达到了显著正相关,相关系数为0.503*,另外2年的相关不显著;籽粒Δ13C与产量的正相关2年达到了极显著水平,相关系数分别为0.601**和0.611**,另外1年相关不显著;基部茎秆的Δ13C与产量的正相关2年均达到了极显著水平,相关系数分别为0.781**和0.561**。而雨养条件下叶片、籽粒和基部茎秆的Δ13C与产量的相关都不显著,但从不同品种的Δ13C和产量结果发现低Δ13C材料在雨养条件下具有较高的产量。在此研究有限灌溉条件下利用碳同位素分辨率作为小麦产量的鉴定指标,其最佳测定器官是成熟期的基部茎秆。
In order to study the reliability of using carbon isotope resolution (Δ13C) as identification index of high-yielding and water-saving wheat varieties, the best organ for screening was screened. Using 20 local wheat cultivars and cultivars in Northwest China as test materials, Irrigation conditions and rain-fed conditions, the flag leaf and grain of each variety were analyzed and determined for three consecutive years in 2006-2008. The carbon isotope resolution (Δ13C value) of base stem and its correlation with yield . The results showed that under the condition of limited irrigation, the correlation between Δ13C of flag leaf and yield reached a significant positive correlation in 2008, the correlation coefficient was 0.503 *, but the correlation was not significant in the other two years. The positive correlation between Δ13C of grain and yield was reached in 2 years The correlation coefficient was 0.601 ** and 0.611 ** respectively, while the other one year was not significant. The positive correlation between Δ13C and yield of base stem reached the significant level in two years, and the correlation coefficients were 0.781 ** And 0.561 **. However, there was no significant correlation between Δ13C and yield of leaves, kernels and stems under rainfed conditions. However, Δ13C and yield of different varieties showed that Δ13C had higher yield under rainfed conditions. In this study, under limited irrigation conditions, the use of carbon isotope resolution as the identification of wheat yield indicators, the best determination of the organ is the mature base stem.