Growth in the apical elongation zone of plant roots is central to the development of functional root systems. It has been known that rice seminal root elongation could be enhanced by water stress. In the present study, 17 cell-wall related genes were identified by cDNA-amplified fragment length polymorphism (cDNA-AFLP) technique. Five genes encoded cell-wall loosening enzymes and six genes were involved in the lignin biosynthesis. The six other genes were related to the metabolism of polysaccharide and protein matrices in cell wall. Northern blot analysis confirmed that they were differentially expressed in the elongation zone of rice seminal roots under water stress, and none of them was root-specific. The results indicated that the activity of cell-wall loosening enzymes was enhanced in the early stage (within 16 h), and some cell wall matrices were synthesized rapidly in the middle stages (from 16 to 48 h), while lignin biosynthesis was enhanced in the middle and late stages of water stress (from 48 to 72 h).
Russian Journal of Plant Physiology – Springer Journals
Published: May 15, 2006
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