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以威优６４及其恢复系测６４－７为对照，对６个杂交晚稻新组合及其恢复系乳熟期受低温冷害后叶绿素含量等７项耐冷性生理生化指标进行了测定分析。结果表明，６个新组合及其恢复系耐冷性较对照均有不同程度的增强，且杂种的耐冷性与恢复系呈显著的正相关。同时，结合田间耐冷性的观察和生理生化指标的分析，确定了叶绿素含量等几个可作为水稻后期耐冷性鉴定的指标。
Using weiliy 64 and its restorer line 64-7 as control, 7 cold tolerance physiological and biochemical indexes such as chlorophyll content of 6 late hybrid rice combinations and their restorer lines under milky ripening stage were measured and analyzed. The results showed that the cold tolerance of the six new combinations and their restorers increased to some extent compared with the control, and the cold tolerance of the hybrids was significantly positively correlated with the restorer lines. At the same time, combined with observation of cold tolerance and physiological and biochemical indexes in the field, it was determined that chlorophyll content could be used as an index to identify cold tolerance in late rice.