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Wang Z.,Hunan Horticultural Research Institute
Acta Horticulturae | Year: 2011

Red flesh color is an important trait for kiwifruit. Red-fleshed kiwifruit have a strong market appeal because of their novelty, visual attractiveness and good taste. In recent years, red-fleshed kiwifruit have been an active area of our research, from breeding to cultivation and postharvest. In our breeding studies, three populations of seedling progenies of different red-fleshed female parents Actinidia chinensis var. rufopulpa were examined; only a small proportion (0 to 14%) of plants had fruit with red flesh color, while the majority of plants had fruit with green or yellow flesh. During cultivation, expression of red flesh color is markedly affected by environmental factors. Higher altitudes, CPPU application, and older plant age are favorable for red flesh color development. Postharvest conditions are also found to affect the stability of red flesh color. Translocation of fruit from cool storage to ambient condition seems to enhance red color degradation. Our studies indicate that red flesh color of kiwifruit is rather unstable. Systematic studies are needed to reveal the genetic, biochemical and physiological basis of red flesh color formation and degradation, to develop cultivation and postharvest protocols, and to breed new cultivars for stable red flesh color development.

Deng W.,Hunan Institute of Agricultural economics and Regional Planning | Yang Y.,Hunan Horticultural Research Institute | Zhu Y.,Hunan Institute of Agricultural economics and Regional Planning | Qian J.,Hunan Institute of Agricultural economics and Regional Planning
Acta Tabacaria Sinica | Year: 2013

Planting area and yield were taken as main indicators to classify 2003 to 2010 tobacco production regions into advantageous, less advantageous and disadvantageous regions. Based on such classification, layout of advantageous regions was arranged. Proposal was made with regards to building "Three Regions" to develope Hunan tobacco production.

Cai J.,Hunan Horticultural Research Institute | Wang Z.,Hunan Horticultural Research Institute
Acta Horticulturae | Year: 2011

This study investigated the relationship between plant vigor and fruit size and quality and flower production of two kiwifruit cultivars, A. chinensis 'Cuiyu' and A. deliciosa 'Miliang-1'. Results showed that plant vigor was a key factor affecting fruit growth and development and the number of flowers the following year. For both cultivars, fruit from strong plants were bigger than those from weak plants. Fruit from strong and medium strength plants had similar SSC, and storability was better. And stronger plants produced more flowers than weaker plants in the following year. The proportion of long shoots (=100 cm) in the current year can be used as an indicator to evaluate the plant vigor at the end of the shoot growing season. For both cultivars, a vigorous plant should have about one third long shoots. Proper techniques in orchard establishment, fertilizer application, pruning and fruit thinning should be applied in order to enhance plant vigor.

Peng J.,Hunan Horticultural Research Institute | Xiao W.,Hunan Horticultural Research Institute | Huang D.,CAS Institute of Subtropical Agriculture | Xiao R.,CAS Institute of Subtropical Agriculture | Wang Z.,Hunan Horticultural Research Institute
Acta Horticulturae | Year: 2011

High temperatures and drought in summer significantly affect fruit yield, quality, appearance and storage life of kiwifruit. It is important to find a solution to overcome these problems. Using rice chaff as the covering material, we studied the effects of ground mulching on soil conditions and plant growth of kiwifruit in Changsha from 2006. The results showed that rice chaff had strong water-holding capacity, with saturated moisture content up to 1.4 times its own weight. Both chaff and chaff plus reflective film treatments substantially lowered the soil temperatures, and maintained them more constant. At the same time, chaff and chaff plus reflective film treatments reduced soil moisture loss effectively and increased soil available nutrient pools rapidly. Defoliation of kiwifruit plants was significantly reduced as a result.

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