Orchestration of three transporters and distinct vascular structures in node for intervascular transfer of silicon in rice

• DOI: 10.1073/pnas.1508987112
• Publication Date: 2015-08-18T02:41:06Z
• Authors: Naoki Yamaji; Gen Sakurai; Namiki Mitani-Ueno; Jian Feng Ma
• Keywords: Vascular tissue; Parenchyma

Requirement of mineral elements in different plant tissues is not often consistent with their transpiration rate; therefore, plants have developed systems for preferential distribution to the developing low transpiration. Here we took silicon (Si) as an example and revealed efficient system Si node rice (Oryza sativa). Rice able accumulate more than 10% dry weight husk, which required protecting grains from water loss pathogen infection. However, it has been unknown a long time how this hyperaccumulation achieved. We found that three transporters (Lsi2, Lsi3, Lsi6) located at are involved intervascular transfer, Si. Lsi2 was polarly localized bundle sheath cell layer around enlarged vascular bundles, next xylem transfer where Lsi6 localized. Lsi3 parenchyma between bundles diffuse bundles. Similar Lsi6, knockout also resulted decreased panicles but increased flag leaf. Furthermore, constructed mathematical model addition cooperation transporters, apoplastic barrier cells development husk.