不同西瓜材料光响应曲线特性分析

Study on Light Response Curve of Photosynthesis of Different Watermelons

利用Li-6400便携式光合测定仪测定了9份不同西瓜材料伸蔓期的光响应曲线,分析各材料曲线的特征参数。结果表明不同材料的光响应特征参数存在差异:最大净光合速率为W4=W5=W6=圆形花皮特早熟=长梭绿皮特早熟=桂红2号>兴桂1号>W9>W12;表观量子效率为圆形花皮特早熟>桂红2号>W4>兴桂1号>长梭绿皮特早熟>W9>W5>W6>W12;暗呼吸速率为桂红2号>长梭绿皮特早熟>圆形花皮特早熟>W5>W4>兴桂1号>W9>W6>W12;光补偿点为长梭绿皮特早熟>W5>桂红2号>W4>圆形花皮特早熟>W12>兴桂1号>W6>W9;光饱和点为W6>W5>长梭绿皮特早熟>W9>兴桂1号>W4>W12>桂红2号>圆形花皮特早熟。由此说明:圆形花皮特早熟、桂红2号利用弱光能力较强,长梭绿皮特早熟光合能力较强,桂红2号暗呼吸较强。圆形花皮特早熟、桂红2号在较弱光强下仍能很好地进行光合作用,与其他材料相比较耐弱光。

The light-response curves of 9 different watermelon varieties were developed at vining stage using the LI-6400 instrument for measuring photosynthesis,and then their characteristic parameters were analyzed.The maximum photosynthetic rates Amax were W4/W5/W6/Yuanxing-huapi-tezaoshu/Changsuo-lupi-tezaoshu/Guihong No.2Xinggui No.1W9 W12.The apparent quantum yields were Yuanxing-huapi-tezaoshuGuihong No.2W4Xinggui No.1 Changsuo-lupitezaoshu W9W5W6W12.The dark respiration rates ranked in decreasing order of Guihong No.2,Changsuo-lupi-tezaoshu,Yuanxing-huapi-tezaoshu,W5,W4,Xinggui No.1,W9,W6 and W12.The light compensation point ranked in descending order of Changsuo-lupi-tezaoshu,W5,Guihong No.2,W4,Yuanxing-huapi-tezaoshu,W12,Xinggui No.1,W6 and W9.The light saturation point was W6W5Changsuo-lupi-tezaoshuW9Xinggui No.1W4W12 Guihong No.2Yuanxing-huapi-tezaoshu.These results show that Yuanxing-huapi-tezaoshu and Guihong No.2 have better ability in use of weak light,Changsuo-lupi-tezaoshu is better in photosynthesis,Guihong No.2 is better at dark respiration.Yuanxing-huapi-tezaoshu and Guihong No.2 are better at photosynthesis compared with other materials under low light intensity.