论文部分内容阅读
观察了两个组合的单交一代、亲本自交系、品种间杂交种一代和父母本自由授粉品种中,植株着生的单个叶片对 CO_2的净吸收率是不同的。杂合型,即单交种、品种间杂交一代和自由授粉品种,与自交系相比,其单位叶面积都显示了一定的高光合率。单位叶面积光合率(P_A),倾向于与单位叶面积中的氮素、叶绿素和干物质含量成正相关。杂合型的高 P_A,部分地归因于其单位叶面积有较高的氮素、叶绿素和干物质含量。在自交系间和在杂合型间一样,其单位叶面积的氮素光合率(氮素生产效率)、单位叶面积的叶绿素光合率(叶绿素生产效率)和单位叶面积的干物质光合率(干物质生产效率),分别地倾向于与单位叶面积的氮素、叶绿素和干物质含量成负相关。作者指出,一般倾向于认为,杂合型的氮素、叶绿素和干物质生产效率,明显地比那些自交系高。杂合型的高 P_A 看来首先与它们的高氮素、叶绿素和干物质生产效率有关。杂合型的高 P_A,与其相对生长速率有密切联系。对少数几个植株的几个叶片 P_A 的测定,可以有效的预示其杂种优势。
The net absorption rate of CO 2 by single leaf of plant was different in two combinations of single cross generation, parental inbred lines, F1 hybrids and parents free pollination. Heterozygous type, that is, single cross, interbreeding generation and free pollination varieties, compared with inbred lines, the unit leaf area showed a certain high photosynthetic rate. Leaf photosynthetic rate per unit area (P_A) tended to positively correlate with nitrogen, chlorophyll and dry matter content in unit leaf area. Heterozygous high P_A was partly attributed to higher nitrogen, chlorophyll and dry matter content per unit leaf area. In inbred lines and heterozygous plants, the photosynthetic rate of nitrogen per unit leaf area (nitrogen production efficiency), the chlorophyll photosynthetic rate per unit leaf area (chlorophyll production efficiency), and the dry matter photosynthetic rate per leaf area (Dry matter production efficiency), respectively, tended to be negatively correlated with nitrogen, chlorophyll and dry matter content per unit leaf area. The authors point out that it is generally preferred to consider heterozygous nitrogen, chlorophyll and dry matter production efficiencies significantly higher than those of inbred lines. Heterozygous high P_A appears to be first and foremost related to their high nitrogen, chlorophyll and dry matter production efficiency. Heterozygous high P_A, and its relative growth rate are closely linked. The determination of P_A on several leaves of a few plants can effectively predict its heterosis.