本文报道了1979—1982年对水稻P_n的遗传研究,结果表明,水稻净光合速率(P_n)属数量遗传性状,受微效多基因控制;水稻P_n主要受核基因组所控制,一般不表现细胞质遗传。控制水稻P_n的基因数目至少在10对以上;水稻P_n的遗传力因组合不同而异。广义遗传力为34.85—66.50%,狭义遗传力为24.40—34.00%;当选择率为5%时,群体所能获得的P_n遗传增量为1.62—3.01mgCO_2/dm~2·hr。 This paper reports the inheritance of P_n in rice from 1979 to 1982. The results showed that the net photosynthetic rate (P_n) of rice is a quantitative genetic trait controlled by the microscopic polygene. The P_n of rice is mainly controlled by the nuclear genome and generally does not show cytoplasmic genetic . The number of genes controlling P_n in rice is at least 10 pairs. The heritability of P_n in rice varies with different combinations. The general heritability was 34.85-66.50%, and heritability was 24.40-34.00% in narrow sense. When the selection rate was 5%, the genetic increment of P_n was 1.62-3.01 mgCO 2 / dm -2 hr.