| The response of photosynthetic capacity of seed watermelon leaves of different seed sizes to the regulation of source\|sink |
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| DOI：10.7606/j.issn.1000-7601.2020.06.10 |
| Key Words: seed watermelon chlorophyll content source\|sink relationship yield seed size leaf\|fruit ratio |
| Author Name | Affiliation | | LI Yu | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Liting | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Nianlai | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to explore the response of the photosynthetic capacity of source\|sink adjustment with significantly different seed sizes, 3 seed watermelon varieties as material,through the pruning and leaf and fruit thinning in flowering fruit period to adjust leaf\|fruit ratio to 10, 20, 30, 40, and 50,in young fruit period, expanding period, and mature period, the chlorophyll content,gas exchange rate, and post\|harvest fruit production were determined. The results showed that the chlorophyll content (SPAD value), net photosynthetic rate (Pn),stomatal conductance (Gs), and transpiration rate (Tr) of functional leaves of seed watermelon gradually decreased with the evolution of fruit growth period while intercellular CO2 (Ci) gradually increased. SPAD value, Pn, Gs, Tr, and Ci were significantly different among the three tested varieties. The gas exchange parameters of large seed variety H26 were significantly lower than that of medium seed variety H14 while H14 was significantly lower than that of small seed variety H3, but SPAD and Ci were opposite. The mean of leaf SPAD, Pn, Gs, and Tr in the fruit growth period drop with leaf\|fruit ratio increases significantly reduced (except leaf\|fruit ratio 50), but the leaf SPAD and gas exchange parameters change had no significant difference between varieties, showed a certain range to reduce leaf\|fruit ratio than improved photosynthetic ability, but thinning leaf process or high leaf\|fruit ratio accelerated chlorophyll degradation, induced leaf senescence.Fruit yield per plant of the three varieties increased with the increase in leaf to fruit ratio, 50 (1.18 kg) >40 and 30 (1.17 kg) >20 (1.16 kg) >10(0.87 kg), fruit yield per plant of H3 (0.88 kg) was significantly lower than that of H26 (1.20 kg) and H14 (1.25 kg). The above results showed that the source/sink ratio in the appropriate range could improve the photosynthetic capacity of seed watermelon leaves, delay the senescence of leaves, and be beneficial to the high yield of seed watermelon. |
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