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对水稻镇恢２４９叶绿素ｂ减少突变体的遗传分析表明，该突变性状是由一对隐性核基因控制的质量性状。 与镇恢２４９相比，突变体的叶绿素含量降低，光合速率低，但其叶绿素ａ与叶绿素ｂ的比值和饱和光强高，光合速率高 值持续期与叶片寿命的比值大。突变体虽然生长量和单穗重较低，但分蘖力增强，成穗率增高，熟期适中，因而仍然具 有每公顷６７５０ｋｇ的较高产量。以上特性决定了该突变体在杂种优势利用中具有较高的应用价值。
Genetic analysis of a chlorophyll b reducing mutant in rice restorer 249 showed that the mutant trait is a quality trait controlled by a pair of recessive nuclear genes. Compared with Zhenhui 249, the mutant had lower chlorophyll content and lower photosynthetic rate, but the ratio of chlorophyll a to chlorophyll b, and higher saturated light intensity, and the ratio of the duration of high photosynthetic rate to leaf life were larger. The mutants, despite their lower growth and single panicle weight, increased tillering power, increased heading percentage and moderate maturity, and thus still had higher yields of 6750 kg per hectare. The above characteristics have determined that the mutant has high application value in heterosis utilization.