论文部分内容阅读
对三个野生稻种,即普通野生稻(Oryza sativa f. spontanea)、药用野生稻(O.officinalis)、疣粒野生稻(O. meyeriana),一个由野生稻演变为栽培稻的过渡型深水莲,五个栽培稻(O.sativa L.)地方品种(六月谷、饭萝白、矮仔占、夜花占、桂161),和三个栽培稻改良品种(包选二、珍珠矮、广陆矮)的光合作用和叶绿素含量作比较研究。结果表明,野生稻的光合作用光饱和点比栽培稻的低;前者为25000～35000lx,后者为35000～45000lx。在饱和光强下,野生稻的光合作用也比栽培稻弱,前者平均为13.0mg CO_2 dm~(-2)h~(-1),后者平均为20.6mg CO_2 dm~(-2)h~(-1)。深水莲的光合作用强度和光饱和点均大约介于野生稻和栽培稻之间。 野生稻的叶绿素含量和叶绿素a/b比亦比栽培稻低;前者平均分别为1.93mg g~(-1) FW和2.55,后者平均分别为2.83 mg g~(-1)FW和3.12。深水莲亦有较高的叶绿素含量和叶绿素a/b比。 上述这些性状,是和野生稻原来是分布在比较荫蔽的生态环境,因而具有阴生植物的光合性状,而栽培稻则比较地具有阳生植物的性状相一致的。
Three wild rice species, Oryza sativa f. Spontanea, O. officinalis, O. meyeriana, a transitional form from wild rice to cultivated rice Shen Long Lian, five cultivated rice (O.sativa L.) local varieties (June Valley, rice white radish, Aizai accounted for Nocturna, 161), and three cultivated rice improved varieties Short, Guang Lu short) photosynthesis and chlorophyll content for comparative study. The results showed that the light saturation point of photosynthesis of wild rice was lower than that of cultivated rice; the former was 25000-35000lx and the latter 35000-45000lx. Under saturated light intensity, the photosynthesis of wild rice was also weaker than that of cultivated rice, the former was 13.0mg CO_2 dm -2 h -1, while the latter was 20.6mg CO_2 dm -2 h ~ (-1). The photosynthesis intensity and light saturation point of Shallow water lotus are about between wild rice and cultivated rice. The chlorophyll content and chlorophyll a / b ratio of wild rice were also lower than that of cultivated rice. The former averaged 1.93 mg g ~ (-1) FW and 2.55, while the latter averaged 2.83 mg g ~ (-1) FW and 3.12, respectively. Deep water lotus has higher chlorophyll content and chlorophyll a / b ratio. These traits described above are the photosynthetic traits of shade plants which are originally covered with wild rice and the cultivated ones are more in conformity with the traits of yangsheng plants.