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为了揭示自然条件下不同种源木棉在广州地区的生长和光合特性的差异,以海南昌江、广东广州、广东揭阳、福建厦门、四川攀枝花、云南红河州和云南景洪7个种源的木棉1年生苗为研究对象,测定其生长性状、叶片光合特性指标和CO2响应曲线。结果表明:在一定范围内增加CO2浓度,净光合速率(Pn)逐渐增大直至趋于稳定,不同种源木棉CO2曲线特征参数有一定差异,但未达显著水平;7个种源木棉的CO2补偿点(CCP)在61.41~7768μmol/mol之间,CO2饱和点(CSP)在667.98~860.58μmol/mol之间。不同种源木棉的株高和气孔交换系数差异显著(P<0.05),表明不同种源间的长势和光合能力有较大差别;相关性分析表明株高与种源的Pn呈显著正相关,表明Pn可作为选取种源的参考指标。
In order to reveal the differences in growth and photosynthetic characteristics of kapok from different provenances under natural conditions in Guangzhou, seven cotton cultivars, namely, Changjiang of Hainan, Guangzhou of Guangdong, Jieyang of Guangdong, Xiamen of Fujian, Panzhihua of Sichuan, Honghe of Yunnan and Jinghong of Yunnan The annual seedlings were used as research object to measure the growth traits, leaf photosynthetic characteristics and CO2 response curve. The results showed that: CO2 concentration increased within a certain range, net photosynthetic rate (Pn) gradually increased until stabilized, different sources of kapok CO2 curve characteristic parameters have some differences, but did not reach a significant level; 7 kinds of provenance kapok CO2 The compensation points (CCP) ranged from 61.41 to 7768μmol / mol and the CO2 saturation point (CSP) ranged from 667.98 to 860.58μmol / mol. The differences of plant height and stomatal exchange coefficient between different provenances were significant (P <0.05), indicating that the growth and photosynthetic capacity of different provenances were different. Correlation analysis showed that there was a significant positive correlation between plant height and Pn of provenances, Pn can be used as reference for selecting provenances.