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Anatomical and Chemical Alterations but not Photosynthetic Dynamics and apoplastic transport Changes are Involved in the Brittleness Culm Mutation of Rice

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Journal of Integrative Plant Biology 2008年第12期50卷 1508-1517页

作者： Zhuang-Qin Duan Jun-Min Wang Lei Bai Zhi-Guang Zhao Kun-Ming Chen Institute of Crop Sciences College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 China College of Life Sciences Lanzhou University Lanzhou 730000 China Institute of Crop and Nuclear Technology Utilization Zhejiang Academy of Agricultural Sciences Hangzhou 310029 China

Brittleness culm is an important agronomic trait that has a potential usefulness in agricultural activity as animal forage although the developmental mechanism is not clear yet. In the present study, the anatomical and chemical characteristics as well as some ecophysiological features in the brittleness culm mutation of rice （Oryza sativa L.） were investigated. Compared with the wild type （WT）, the brittleness culm mutant （bcm） exhibited higher culm vascular bundle distance and lower culm wall thickness, leaf interveinal distance and leaf thickness. Ratio of bundle sheath cell/whole bundle and areas of whole vascular bundles and bundle sheath of leaves were reduced while ratios of xylem and phloem to whole bundles were elevated in bcm. The Fourier transform infrared （FTIR） microspectroscopy analysis and further histochemical and physiological measurements revealed that the different contents and depositions of cell wall components such as pectins, lignin, suberin and cellulose all participated in the mutation of brittleness. However, the mutant presented no significant changes in leaf photosynthetic dynamics and apoplastic transport ability. These results strongly indicate that the alterations in anatomical and chemical characteristics, rather than changes in major ecophysiological features such as photosynthesis and apoplastic transport were involved in the brittleness mutation of rice.

关键词： anatomical and chemical characteristics apoplastic transport brittleness culm mutant photosynthetic dynamic rice.

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Anatomical and Chemical Characteristics of a Rolling Leaf Mutant of Rice and Its Ecophysiological Properties

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Rice science 2008年第3期15卷 201-208页

作者： BAI Lei DUAN Zhuang-qin WANG Jun-min AN Li-zhe ZHAO Zhi-guang CHEN Kun-ming College of Life Sciences Lanzhou University Lanzhou 730000 China Institute of Crop Sciences College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 China Institute of Crop and Nuclear Technology Utilization Zhejiang Academy of Agricultural Sciences Hangzhou 310021 China

The anatomical and chemical characteristics of a rolling leaf mutant （rlm） of rice （Oryza sativa L.） and its ecophysiological properties in photosynthesis and apoplastic transport were investigated. Compared with the wild type （WT）, the areas of whole vascular bundles and xylem as well as the ratios of xylem area/whole vascular bundles area and xylem area/phloem area were higher in rim, whereas the area and the width of foliar bulliform cell were lower. The Fourier transform infrared （FTIR） microspectroscopy spectra of foliar cell walls differed greatly between rim and WT. The rim exhibited lower protein and polysaccharide contents of foliar cell walls. An obvious reduction of pectin content was also found in rim by biochemical measurements. Moreover, the rate of photosynthesis was depressed while the conductance of stoma and the intercellular CO2 concentration were enhanced in rim. The PTS fluorescence, which represents the ability of apoplastic transport, was 11% higher in rim than in WT. These results suggest that the changes in anatomical and chemical characteristics of foliar vascular bundles, such as the reduction of proteins, pectins, and other polysaccharides of foliar cell walls, participate in the leaf rolling mutation, and consequently lead to the reduced photosynthetic dynamics and apoplastic transport ability in the mutant.

关键词： rice rolling leaf mutant anatomical characteristics chemical characteristics apoplastic transport ecophysiological property Fourier transform infrared microspectroscopy

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