This study was to investigate the influence of SPVD on the growth devel- opment and yield formation of sweet potato, The virus seeding, landrace, virus-free seedlings of high starch sweet potato XichengO07 were inocul...This study was to investigate the influence of SPVD on the growth devel- opment and yield formation of sweet potato, The virus seeding, landrace, virus-free seedlings of high starch sweet potato XichengO07 were inoculated with SPVD for revealing the interaction mechanism, The results showed that SPVD could result in clustering and dwarfing of sweet potato plant type, smaller leaves and lower effec- tive of leaf area, reduced chlorophyll content, and smaller source, lowered assimila- tive ability and photosynthetic capacity. The flow became smaller, further finally led to the reduced biological yield, and the desorption of SPVD could increase leaf ＂source＂ and the chlorophyll content, improve photosynthetic and flow ability, thus raising the output of production. SPVD could reduce the activities of SOD, POD and CAT in sweet potato plant, increase the content of MDA, decrease antioxidant activity and production, damage the cell membrane. However, virus-free treatment could increase the activities of SOD, POD and CAT in plants, which was helpful to reduce the harm of MDA. After the desorption of SPVD, the production of above- ground was increased by 3.4% and the production of fresh sweet potato was up by 2.9%, while SPVD dissemination could result in the reduction of the aboveground and fresh tubers by 69.9% and 49.1%, respectively.展开更多
Present work highlights, first time in Egypt, the impact of OYDV infection on crops production. Plants grown in the field were individually labelled as either apparently healthy or diseased and were marked for harvest...Present work highlights, first time in Egypt, the impact of OYDV infection on crops production. Plants grown in the field were individually labelled as either apparently healthy or diseased and were marked for harvesting. The percentage of yield loss due to viral infection was determined, on the basis of the average yield parameters of the healthy plant. The natural infection with OYDV in onion and garlic fields resulted in a substantial reduction in pseudo-stem length, number of leaves, plant weight and weight of bulb as well as number and weight of cloves. Results clearly indicate the impact of natural infection with OYDV on the crop yield of infected onion and garlic plants in comparison with the virus-free （uninfected） ones. The largest reduction in the yield of infected plants occurred in Chinese garlic （Seds40） followed by （Baladi） garlic and onion Giza 20. This information suggests that measures have to be taken to prevent natural infection with OYDV into and within onion and garlic fields in order to avoid yield loss.展开更多
Two Tahiti lime （Citrus latifolia Tan.） experiments were carried out to evaluate the performance of eight standard rootstocks on two different soil locations at Tecoman Colima, Mexico. Rootstocks were selected by th...Two Tahiti lime （Citrus latifolia Tan.） experiments were carried out to evaluate the performance of eight standard rootstocks on two different soil locations at Tecoman Colima, Mexico. Rootstocks were selected by their tolerance to Citrus tristeza virus （CTV） and acceptable adaptation to semi-add hot tropics environment. The first trial was planted in ＂Cerrito de Aguilar＂ （CA） location which had sandy-loam soil with a fluctuant water table at 100 cm depth. The second experiment was planted in ＂Crucero Tecoman＂ （CT） on a sandy deep soil with no water table restriction. At CT location the best Tahiti lime growth, yield and fruit quality were observed on Alemow rootstock. The same combination at CA showed a poor performance and was affected by diseases due to high moisture conditions by the superficial water table. Taiwanica, Swingle citrumelo and Rangpur lime rootstocks were less productive than Alemow, but showed a good adaptation and acceptable yield on both soil conditions. Among them, Swingle citrumelo was a promising rootstock because it showed standard tree growth, good yield and excellent fruit quality. Swingle citrumelo also showed an acceptable performance on soil with high presence ofPhytophthora sp. and moderate levels of calcium carbonate （near to 3,500 ppm）. Taiwanica and Rangpur lime performed well during the six years of the experiment, but trees began to be affected by root diseases. Better performance of most Tahiti lime/rootstocks were found on sandy depth soil than on superficial wet soils.展开更多
基金Supported by Construction Program of Culitvation Post for Mid-lower Reaches of Yangtze River of Modern Agricultural Industry Technology System(nycytx-16-B-13)Program from Nanchong Experimental Station of Modern Agricultural Industry Technology System(nycytx-16-c-16)Program of Sichuan-Chongqing Potato and Soybean Observation Station of Ministry of Agriculture~~
文摘This study was to investigate the influence of SPVD on the growth devel- opment and yield formation of sweet potato, The virus seeding, landrace, virus-free seedlings of high starch sweet potato XichengO07 were inoculated with SPVD for revealing the interaction mechanism, The results showed that SPVD could result in clustering and dwarfing of sweet potato plant type, smaller leaves and lower effec- tive of leaf area, reduced chlorophyll content, and smaller source, lowered assimila- tive ability and photosynthetic capacity. The flow became smaller, further finally led to the reduced biological yield, and the desorption of SPVD could increase leaf ＂source＂ and the chlorophyll content, improve photosynthetic and flow ability, thus raising the output of production. SPVD could reduce the activities of SOD, POD and CAT in sweet potato plant, increase the content of MDA, decrease antioxidant activity and production, damage the cell membrane. However, virus-free treatment could increase the activities of SOD, POD and CAT in plants, which was helpful to reduce the harm of MDA. After the desorption of SPVD, the production of above- ground was increased by 3.4% and the production of fresh sweet potato was up by 2.9%, while SPVD dissemination could result in the reduction of the aboveground and fresh tubers by 69.9% and 49.1%, respectively.
文摘Present work highlights, first time in Egypt, the impact of OYDV infection on crops production. Plants grown in the field were individually labelled as either apparently healthy or diseased and were marked for harvesting. The percentage of yield loss due to viral infection was determined, on the basis of the average yield parameters of the healthy plant. The natural infection with OYDV in onion and garlic fields resulted in a substantial reduction in pseudo-stem length, number of leaves, plant weight and weight of bulb as well as number and weight of cloves. Results clearly indicate the impact of natural infection with OYDV on the crop yield of infected onion and garlic plants in comparison with the virus-free （uninfected） ones. The largest reduction in the yield of infected plants occurred in Chinese garlic （Seds40） followed by （Baladi） garlic and onion Giza 20. This information suggests that measures have to be taken to prevent natural infection with OYDV into and within onion and garlic fields in order to avoid yield loss.
文摘Two Tahiti lime （Citrus latifolia Tan.） experiments were carried out to evaluate the performance of eight standard rootstocks on two different soil locations at Tecoman Colima, Mexico. Rootstocks were selected by their tolerance to Citrus tristeza virus （CTV） and acceptable adaptation to semi-add hot tropics environment. The first trial was planted in ＂Cerrito de Aguilar＂ （CA） location which had sandy-loam soil with a fluctuant water table at 100 cm depth. The second experiment was planted in ＂Crucero Tecoman＂ （CT） on a sandy deep soil with no water table restriction. At CT location the best Tahiti lime growth, yield and fruit quality were observed on Alemow rootstock. The same combination at CA showed a poor performance and was affected by diseases due to high moisture conditions by the superficial water table. Taiwanica, Swingle citrumelo and Rangpur lime rootstocks were less productive than Alemow, but showed a good adaptation and acceptable yield on both soil conditions. Among them, Swingle citrumelo was a promising rootstock because it showed standard tree growth, good yield and excellent fruit quality. Swingle citrumelo also showed an acceptable performance on soil with high presence ofPhytophthora sp. and moderate levels of calcium carbonate （near to 3,500 ppm）. Taiwanica and Rangpur lime performed well during the six years of the experiment, but trees began to be affected by root diseases. Better performance of most Tahiti lime/rootstocks were found on sandy depth soil than on superficial wet soils.
