Nagayama Teruki, Tatsumi Akane, Nakamura Atsuko, Yamaji Naoki, Satoh Shinobu, Furukawa Jun, Iwai Hiroaki
Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
Research Institute for Bioresources, Okayama University, Chuo, Kurashiki 710-0046, Japan.
AoB Plants. 2022 Feb 23;14(2):plac003. doi: 10.1093/aobpla/plac003. eCollection 2022 Apr.
The roots of many plant species contain large amounts of pectin and it contributes to the formation of the rhizosphere. In the present study, the relationship between the root-tip pectin content and aluminium (Al) tolerance in wild-type (WT) and demethylesterified pectin degradation enzyme gene overexpressor (-FOX) rice lines was compared. -FOX rice showed reduced pectin content in roots, even under control conditions; Al treatment reduced root elongation and the pectin content in the root elongation zone. Wild-type rice showed more pectin accumulation in the root elongation zone after Al treatment. Relative to WT rice, -FOX rice showed more Al accumulation in the root elongation zone. These results indicate that the amount of pectin influences Al tolerance and that the distribution of pectin in the root elongation zone inhibits Al accumulation in rice roots. Pectin accumulation in cell walls in the root elongation zone may play a role in protecting rice plants from the Al-induced inhibition of root elongation by regulating pectin distribution.
许多植物物种的根含有大量果胶，且其有助于根际的形成。在本研究中，比较了野生型（WT）和去甲基酯化果胶降解酶基因过表达体（-FOX）水稻品系根尖果胶含量与铝（Al）耐受性之间的关系。-FOX水稻即使在对照条件下根中的果胶含量也降低；铝处理降低了根伸长以及根伸长区的果胶含量。野生型水稻在铝处理后根伸长区有更多的果胶积累。相对于野生型水稻，-FOX水稻在根伸长区积累了更多的铝。这些结果表明，果胶量影响铝耐受性，且根伸长区果胶的分布抑制水稻根中铝的积累。根伸长区细胞壁中的果胶积累可能通过调节果胶分布在保护水稻植株免受铝诱导的根伸长抑制方面发挥作用。
