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Genotype and Planting Density Effects on Rooting Traits and Yield in Cotton (Gossypium hirsutum L,)
作者姓名:Li-Zhen  Zhang  Bao-Guo  Li  Gen-Tu  Yan  Wopke  van  der  Werf  JHJ  Spiertz  Si-Ping  Zhang
作者单位:[1]Laboratory for Plant-Soil Interaction Processes, Ministry of Education, College of Natural Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China; [2]Cotton Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Cotton Genetic Improvement, Ministry of Agriculture, Anyang 455004, China; [3]Wageningen University, Crop and Weed Ecology Group, 6700 AK, Wageningen, the Netherlands
基金项目:Supported by the Program for Changjiang Scholars and Innovative Re- search Teams in Universities (IRT0412) and the "948" Project of Chinese Ministry of Agriculture.
摘    要:Root density distribution of plants is a major Indicator of competition between plants and determines resource capture from the solh This experiment was conducted in 2005 at Anyang, located in the Yellow River region, Henan Province, China. Three cotton (Gossyplum hlrsutum L.) cultivars were chosen: hybrid Btcultlvar CRI46, conventional Btcultlvars CRI44 and CRI45. Six planting densities were designed, ranging from 1.5 to 12.0 plants/m^2. Root parameters such as surface area, diameter and length were analyzed by using the DT-SCAN Image analysis method. The root length density (RLD), root average diameter and root area Index (RAI), root surface area per unit land area, were studied. The results showed that RLD and RAI differed between genotypes; hybrid CRI46 had significantly higher (P 〈0.05) RLD and RAI values than conventlonal cultlvars, especially under low planting densities, less than 3.0 plants/m^2. The root area index (RAI) of hybrid CRI46 was 61% higher than of CRI44 and CRI45 at the flowering stage. The RLD and RAI were also significantly different (P = 0.000) between planting densities. The depth distribution of RAI showed that at Increasing planting densities RAI was Increasingly distributed in the soil layers below 50 cm. The RAI of hybrid CRI46 was for all planting densities, obviously higher than other cultivars during the flowering and boll stages. It was concluded that the hybrid had a strong advantage in root maintenance preventing premature senescence of roots. The root diameter of hybrid CRI46 had a genetically higher root diameter at planting densities lower than 6.0 plants/m^2. Good associations were found between yield and RAI In different stages. The optimum planting density ranged from 4.50 plants/m^2 to 6.75 plants/m^2 for conventional cultlvars and around 4.0-5.0 plants/m^2 for hybrids.

关 键 词:基因型  种植密度  根性状  棉花
收稿时间:2006-02-23
修稿时间:2006-02-232006-08-10

Genotype and Planting Density Effects on Rooting Traits and Yield in Cotton (Gossypium hirsutum L.)
Authors:Li-Zhen Zhang  Bao-Guo Li  Gen-Tu Yan  Wopke van der Werf  JHJ Spiertz  Si-Ping Zhang
Institution:Laboratory for Plant-Soil Interaction Processes, Ministry of Education, College of Natural Resources and Environmental Sciences, China Agricultural University;, Beijing 100094, China;Cotton Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Cotton Genetic Improvement, Ministry of Agriculture;, Anyang 455004, China;Wageningen University, Crop and Weed Ecology Group;, 6700 AK, Wageningen, the Netherlands)
Abstract:Root density distribution of plants is a major indicator of competition between plants and determines resource capture from the soil. This experiment was conducted in 2005 at Anyang, located in the Yellow River region, Henan Province, China. Three cotton (Gossypium hirsutum L.) cultivars were chosen: hybrid Bt‐cultivar CRI46, conventional Bt‐cultivars CRI44 and CRI45. Six planting densities were designed, ranging from 1.5 to 12.0 plants/m2Root parameters such as surface area, diameter and length were analyzed by using the DT‐SCAN image analysis method. The root length density (RLD), root average diameter and root area index (RAI), root surface area per unit land area, were studied. The results showed that RLD and RAI differed between genotypes; hybrid CRI46 had significantly higher (P < 0.05) RLD and RAI values than conventional cultivars, especially under low planting densities, less than 3.0 plants/m2The root area index (RAI) of hybrid CRI46 was 61% higher than of CRI44 and CRI45 at the flowering stage. The RLD and RAI were also significantly different (P= 0.000) between planting densities. The depth distribution of RAI showed that at increasing planting densities RAI was increasingly distributed in the soil layers below 50 cm. The RAI of hybrid CRI46 was for all planting densities, obviously higher than other cultivars during the flowering and boll stages. It was concluded that the hybrid had a strong advantage in root maintenance preventing premature senescence of roots. The root diameter of hybrid CRI46 had a genetically higher root diameter at planting densities lower than 6.0 plants/m2Good associations were found between yield and RAI in different stages. The optimum planting density ranged from 4.50 plants/m2 to 6.75 plants/m2 for conventional cultivars and around 4.0–5.0 plants/m2 for hybrids. (Managing editor: Ya‐Qin Han)
Keywords:resource capture  root area index  root diameter  root length density  
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