Song R.,Henan Agricultural University |
Song R.,Key Laboratory of Crop Physiological Ecology and Farming System |
Zhao C.-Y.,Henan Agricultural University |
Zhao C.-Y.,Key Laboratory of Crop Physiological Ecology and Farming System |
And 13 more authors.
Acta Physiologiae Plantarum | Year: 2013
The effect of sulphate nutrition on arsenic (As) concentration, photosynthetic and chlorophyll fluorescence parameters of rice was investigated in hydroponically grown rice seedlings (Oryza sativa L.), using three sulphate levels (1.8 μM, 0.7 mM, or 1.5 mM). The results showed that sulphate deficiency decreased As accumulation in root, but increased the translocation of As from root to shoot. Sulphate deficiency reduced maximum quantum yield (Fv/Fm), minimum fluorescence and electron transport rate (ETR) of a dark-adapted leaf. Compared with low sulphate treatments (1.8 μM), significant increases were observed in the parameters of rapid light curves, rETRmax and I k of photosystem I (PSI) and photosystem II (PSII) of rice grown in the high sulphate treatments (1.5 mM) regardless of As additions. Therefore, an adequately high sulphate supply may result in less As translocation from root to shoot, and protecting the reaction pathways of PSI and PSII of rice seedlings grown in higher As-contaminated medium. © 2013 Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków.
Song X.,Henan Agricultural University |
Du Y.,Henan Agricultural University |
Zhao Q.,Henan Agricultural University |
Zhao Q.,Key Laboratory of Crop Physiological Ecology and Farming System
Cereal Chemistry | Year: 2013
High-quality japonica rices Yujing 6 and Fangxin 4 were cultured under ambient night temperature (ANT, 19.7°C) and high night temperature (HNT, 26.7°C) in a greenhouse for the analysis of amyloplast development and grain quality during the grain-filling stage. Results indicated that the HNT treatment had distinct effects on the grain-filling rate of Yujing 6 and Fangxin 4 1-10 days after anthesis. HNT increased the rate of grain filling by 9.89-40.45% and decreased the accumulation of grainfilling matter, resulting in inferior appearance and poor milling qualities (e.g., brown rice rate, milled rice rate, head rice rate, imperfect rice rate, chalky rice rate, and chalkiness degree). Results from a rapid viscosity analyzer showed that the HNT treatment decreased the paste viscosity, depending on the rice cultivar. Differential scanning calorimetry results indicated that the gelatinization temperatures of HNT such as onset temperature, peak temperature, and final temperature were all significantly higher than those of ANT. However, HNT had no distinct effects on the X-ray diffraction pattern of rice starch. © 2013 AACC International, Inc.