| Diurnal variation of photosynthesis and light intensity response of two seed watermelons in dry sandy land |
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| DOI：10.7606/j.issn.1000-7601.2018.05.08 |
| Key Words: the dry sandy land seed watermelon diurnal variations of photosynthesis light response grey correlation analysis |
| Author Name | Affiliation | | YANG Yu-miao | Forestry College of Gansu Agricultural University, Lanzhou, Gansu 730070, China | | JIANG Zhi-rong | Forestry College of Gansu Agricultural University, Lanzhou, Gansu 730070, China | | AN Li | Horticulture College of Gansu Agriculture University, Lanzhou, Gansu 730070,China | | LUO Jian | Horticulture College of Gansu Agriculture University, Lanzhou, Gansu 730070,China | | ZHANG Yong-wen | Horticulture College of Gansu Agriculture University, Lanzhou, Gansu 730070,China |
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| Abstract: |
| Photosynthetic indexes of ‘Heifeng 1’ and ‘Jingyuan daban’ at Jingyuan county’s dry sandy land were analyzed to detect photosynthetic differences between the two varieties. The results showed that both light saturation point （3 818.18 μmol·m -2·s-1) and light compensation point (67.47 μmol·m-2·s-1) of Heifeng 1 were higher than which of ‘Jingyuan daban’ for its higher demand light intensity . Photosynthetic capacity, water use efficency （203% at 12∶00）and drought resistance of Heifeng 1 were higher than which of Jingyuan daban under strong light condition. Tr of two seed watermelons correlated significantly to the Pn, Gs and Ci while Ci coreelated negtively to other indexes with adverse tren. There were significant differences in the photosynthetic indexes of the same varitiey of seed watermelon, the difference of Gs among individuals was not significant, and the difference of Ci was relatively significant. Grey correlation analysis showed that Pn (correlated order 1) and PAR (correlated order 2) were key indexes to affect photosynthetic capacity of watermelons. The finds suggest Heifeng 1 prefer to local conditions. |
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