Mechanisms of Assimilation Transport in Phloem of Rice and Its Response to Abiotic Stress

doi:10.3969/j.issn.1000-6362.2018.02.001

Abstract

Abstract: Carbon assimilation and distribution in source, sink and stream played critical roles in the grain yield and quality of crops, which were always adversely affected by abiotic stress in these years. It has been reported that extreme heat stress occurred at the reproductive stage significantly decreased the grain yield and quality of rice, and thus threaten the food security. Recent studies about the mechanism underlying the damages on the grain yield and quality of rice caused by abiotic stresses focused on that, (1) The assimilation was loaded in leaf by the apoplasmic and symplasmic pathway, and then transported to grains via the vascular bundles of leaf, stem, rachis branch and pedicel relied on the pressure generated by source and sink. (2) The carbohydrates loading, transport and unloading in phloem of rice may be affected by the abiotic stress, such as heat stress, cold stress, drought stress and nutrient deficiency significantly, which inhibited the assimilates transport, finally decreased the grain yield and quality of rice. (3) As the limitation on research methods and techniques, the previous results about the negative effects on the assimilation transport of plants under abiotic stress were little. Development and application of new technology would provide new opportunity for the further study in these fields.

Key words: Rice, Assimilate transport, Sugar transporters, Phloem, Abiotic stress

ZHANG Cai-xia, FU Guan-fu, FENG Bao-hua, CHEN Ting-ting, TAO Long-xing. Mechanisms of Assimilation Transport in Phloem of Rice and Its Response to Abiotic Stress[J]. Chinese Journal of Agrometeorology, 2018, 39(02): 73-83.

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