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RISS 인기검색어
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- 저자 : Cunde Pan (검색결과 2 건)
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Cuifang Zhang,Cunde Pan,Hong Chen,Shiwei Wang 한국원예학회 2020 원예과학기술지 Vol.38 No.4
This study examined the Juglans regia ‘Xinxin2’ walnut variety using combined field control experiments with laboratory chemical analyses and analyzed the effects of the relationships among net photosynthetic rate (Pn), specific mass transfer rate (SMTR), nut dry mass (NDM), and nut yield per girdled fruit-bearing shoot (Yield) on the leaf-to-fruit ratio (LFR). We used comprehensive decision-making based on mathematical programming to determine the optimal LFR for this walnut variety in the peak fruiting stage. The optimal LFR was calculated as the comprehensive expected value of the linear combination among the equations for the effects of LFR on the Pn, SMTR, NDM, and Yield and was determined to be 2.02. Compared with walnut plants without LFR adjustment, the walnut plants with LFR adjustment using 2.02 as the minimum threshold had a 19.52% lower nut yield, a higher nut quality (Special Class, Class I, and Class II accounted for 100% of the nut yield per 670 m2), and a 36.22% higher economic output value per 670 m2. This study indicates that improving fruit quality to produce Grade I and II nuts will increase economic output, although the total yield will decrease when managing efficient LFR in nut production.
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The Relationship between Carbohydrate Translocation and the LeaftoFruit Ratio in Walnut Trees
Cuifang Zhang,Cunde Pan,Hong Chen,Shiwei Wang 한국원예학회 2020 원예과학기술지 Vol.38 No.3
This study determined the relationship between the leaftofruit ratio (LFR) and carbohydrate translocation in walnut tree. We artificially manipulated the LFR to analyze the specific mass transfer rate (SMTR), physical traits, carbohydrate content, and metabolismrelated enzyme activity in the carpopodium of girdled fruitbearing shoots with different LFRs. Our findings showed that when the same number of leaves was retained on the girdled shoots, the glucose content, acid invertase (AI) and sucrose phosphate synthase (SPS) activity, SMTR, and phloem area (PA) increased significantly with decreasing LFR (p < 0.05), whereas the sucrose and starch content, carpopodium diameter growth rate (CDGR), and carpopodium length growth rate (CLGR) did not change significantly (p > 0.05). When the same number of fruits was retained on the girdled shoots, the glucose, sucrose and starch content, AI and SPS activity, SMTR, CLGR, and CDGR of the carpopodium increased significantly with increasing LFR (p < 0.01), whereas the PA and carpopodium length did not change significantly (p > 0.05). The above results suggested that the carbohydrate translocation was adjusted by regulating the carpopodium AI activity by changing the LFR in walnut shoots, while the amount of carbohydrate allocated to the carpopodium was determined by the availability of carbohydrates from the sources.
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