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玉米籽粒产量受许多复杂过程的影响。但同化物源的强弱和籽粒库的大小通常被认为是决定最终产量的两个主要因子。在玉米上,关于究竟是源还是库限制产量的证据还有争议。一些研究已证明源的代谢活动影响籽粒产量(Egharevba等,1976;Tollenaar和Daynard,1978;Hunter,1980;Schoper等,1982)。既便是组培玉米果穗顶端的小籽粒也比田间果穗的大3倍多(Hanft等,1986)。这
Maize grain yield is affected by many complex processes. However, the strength of the assimilate source and the size of the grain bank are generally considered to be the two major determinants of the final yield. On corn, there is controversy as to whether the source or the bank is limiting yield. Some studies have demonstrated that metabolic activity of the source affects grain yield (Egharevba et al., 1976; Tollenaar and Daynard, 1978; Hunter, 1980; Schoper et al., 1982). Even small kernels at the tip of tissue maize ears were more than three times larger than field ears (Hanft et al., 1986). This