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Zhou J.,Zhongkai University of Agriculture and Engineering | Zhong G.,Zhongkai University of Agriculture and Engineering | Lin Z.,Zhongkai University of Agriculture and Engineering | Xu H.,International Nature Farming Research Center
Journal of Food, Agriculture and Environment | Year: 2012

The effects of bagging with different bags to the clusters on fresh fruit quality in Xiangtian olive of Canarium album were studied. The results indicated that, the color and smoothness were better, the edible pulp rate and ascorbic acid concentration were higher after bagging than in the control during the two years' experiments, but the fruit soluble solids were decreased. It showed that the golden yellow color, more smoothness, higher single fruit weight, more delicate flesh and better degree of slag for the fruits were obtained with Shengda double-layer bags especially. However, the bags need size specifications modified with few holes on the bottom. Source

Xu H.-L.,International Nature Farming Research Center | Qin F.,International Nature Farming Research Center | Qin F.,Shandong Peanut Research Institute | Xu Q.,International Nature Farming Research Center | And 2 more authors.
Scientia Horticulturae | Year: 2011

Partial root zone drying (PRD) has been used as a technique in the production of many crops. However, the extent or duration of the drying treatment would change the effect and the mechanisms in terms of plant water relations are not clear enough. The aim of this research was to evaluate the PRD effect with shorter or longer drying duration in a potato crop and elucidate the mechanisms based on plant water relations. Potato (Solanum tuberosum L. cv. May Queen) was grown in experimental plots under plastic rainout shelters. Three treatments: (1) whole-season PRD, (2) early-season PRD for 8 weeks and then return to normal irrigation for the remainder of the season and (3) normal irrigation as control, were arranged in a Latin square design in 9 plots. Water was supplied by drip irrigation to one side of the potato row once every 5 days on average, and the other side of the row was allowed to dry for 15 days, and then the irrigation line was moved to the dry side and the wet side allowed to dry. Pressure-volume curves were used to analyze the osmotic adjustment induced by PRD and a modified mathematic equation, -Ψ-1=ΨFT-1-πs+a-1[ζ0-β(1-ζ)-ζap]e-α(1-ζ)+πs+a-1[ζ0-β(1-ζ)-ζap] was used to compare the pressure-volume relations. As shown by the results, tuber yield and photosynthetic activity were increased by the early-season PRD treatment, but not by the whole-season PRD treatment because the whole-season PRD treatment reduced the leaf area index. By analyzing the pressure-volume curves, it was found that osmotic adjustment occurred and the turgor potential was higher in potato leaves in the PRD treatments. The fraction of water in the cell symplasm was higher and that in apoplasm was smaller in PRD-treated potato leaves. Both the osmotic potential and relative water content at the point of incipient plasmolysis were lower in potato leaves in the PRD treatments, suggesting that the plants in the PRD plots were more resistant to water stress, which was also confirmed by the analysis of transpiration declining curve of excised leaves. In conclusion, the PRD treatment was effective in improving potato tuber yield, but early-season treatment rather than the whole-season treatment should be adopted. © 2011 Elsevier B.V. Source

Lu P.,Zhongkai University of Agriculture and Engineering | He S.,Zhongkai University of Agriculture and Engineering | Li H.,Zhongkai University of Agriculture and Engineering | Cao J.,Zhongkai University of Agriculture and Engineering | Xu H.-L.,International Nature Farming Research Center
Journal of Food, Agriculture and Environment | Year: 2010

Vase life of cut roses cv. Movie Star placed in deionized water was only 9 to 10 days regardless of the maturity at harvest. In the present study, the causes of short vase life for cut roses and the effects of treatments prolonging vase life were investigated in relation to water stress and bacterial contaminations. Flowers of cut rose cv. Movie Star were pulsed in nano-silver (NS) base solution for 24 h and then kept in a low concentration NS solution. Effects on vase life and the flower quality were evaluated by analyzing vase life, water uptake, water loss, changes in stomatal conductance and scanning electron microscopic observation of stem. The pulse treatment in 10 mg L -1 NS plus 5% sucrose solution for 24 h followed by holding samples in 0.5 mg L-1 NS plus 2% sucrose solution not only alleviated and delayed vascular blockage caused by bacterial contaminations but also inhibited stomatal conductance so that the water balance in cut roses was significantly improved and the vase life of the cut rose flowers was prolonged by 11.8 days. Source

Qin F.,University of Tokyo | Qin F.,International Nature Farming Research Center | Qin F.,Shandong Peanut Institute | Takano T.,University of Tokyo | Xu H.-L.,International Nature Farming Research Center
Journal of Food, Agriculture and Environment | Year: 2012

When photosynthetic photon flux (PPF) is changed from low to high and then from high to low, the photosynthetic rate (P N) at each PPF level is usually higher during the cycle of changing PPF from high to low than during the cycle from low to high. The difference between the two PPF response curves is defined as photosynthetic hysteresis (H P). H P would be smaller if physiological activities are high in a plant. The previous experiments of our research have demonstrated that physiological activities are higher in peanut plants grown with the AnM technique including hypocotyl exposure. In the present experiment, H P was examined in the peanut crop grown with the AnM technique. Peanut leaf photosynthetic activities were improved by exposing the hypocotyl, one practice of the AnM technique, and film mulching, the combined practice of the modified AnM technique. The improved photosynthetic activities also reflected in less H P. H P was consistent with hysteresis of stomatal and mesophyll conductance. Less H P could be an indicator of higher physiological activities, as improved by the hypocotyl exposing and film mulching in the peanut crop. Source

Nie S.,International Nature Farming Research Center | Xu H.,International Nature Farming Research Center
PLoS ONE | Year: 2016

As a resistance elicitor, riboflavin (vitamin B2) protects plants against a wide range of pathogens. At molecular biological levels, it is important to elucidate the signaling pathways underlying the disease resistance induced by riboflavin. Here, riboflavin was tested to induce resistance against virulent Pseudomonas syringae pv. Tomato DC3000 (Pst DC3000) in Arabidopsis. Results showed that riboflavin induced disease resistance based on MAPK-dependent priming for the expression of PR1 gene. Riboflavin induced transient expression of PR1 gene. However, following Pst DC3000 inoculation, riboflavin potentiated stronger PR1 gene transcription. Further was suggested that the transcript levels of mitogen- Activated protein kinases, MPK3 and MPK6, were primed under riboflavin. Upon infection by Pst DC3000, these two enzymes were more strongly activated. The elevated activation of both MPK3 and MPK6 was responsible for enhanced defense gene expression and resistance after riboflavin treatment. Moreover, riboflavin significantly reduced the transcript levels of MPK3 and MPK6 by application of AsA and BAPTA, an H2O2 scavenger and a calcium (Ca2+) scavenger, respectively. In conclusion, MPK3 and MPK6 were responsible for riboflavin-induced resistance, and played an important role in H2O2- And Ca2+-related signaling pathways, and this study could provide a new insight into the mechanistic study of riboflavin-induced defense responses. © 2016 Nie, Xu.This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Source

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