Barnyardgrass Root Recognition Behaviour for Rice Allelopathy
Barnyardgrass Root Recognition Behaviour for Rice Allelopathy
复制标题
DOI：
10.3390/agronomy8040039
复制
发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Tingshuang Zhang;Bo Fan;Peng Wang
中科院分区：
文献类型：
--
作者：
Tingshuang Zhang;Bo Fan;Peng Wang
最近的研究表明，地下邻居的存在诱导植物的不同形态和生化反应。植物的化感活性是由竞争者幼苗或竞争者根系分泌物的存在引起的。然而，它是未知的化感作用是否也影响根识别行为在杂草作物相互作用。为了评估稗草对化感水稻根系的反应，我们进行了稗草-水稻混合培养的温室试验，包括稗草单作、稗草与化感水稻品系PI 312777混合以及稗草与非化感水稻品种辽粳9混合。结果表明，与单作稗草相比，化感水稻根系的存在提高了稗草的根系分配和组织密度（RTD），降低了稗草的根系生物量、总根长、比根长和拓扑指数（TI），且拓扑指数与根系觅食精度和竞争性显著相关。因此，化感水稻根系的存在影响了稗草根系的形态、养分的觅食和竞争，表明化感作用在稗草-水稻竞争互作的根系识别行为中起着关键作用。
Recent studies have demonstrated that the presence of belowground neighbours induces varied morphological and biochemical responses in plants. Plant allelopathic activity is elicited by the presence of competitor seedlings or competitor root exudates. However, it is unknown whether allelopathy also influences root recognition behaviour in weed–crop interaction. To assess barnyardgrass response to the presence of allelopathic rice roots, we conducted a greenhouse experiment of barnyardgrass–rice mixed culture, including barnyardgrass monoculture, barnyardgrass mixed with the allelopathic rice line PI312777 and barnyardgrass mixed with the nonallelopathic rice cultivar Liaojing-9. Our results showed that the presence of allelopathic rice roots enhanced root allocation and tissue density (RTD) of barnyardgrass, whereas it decreased root biomass, total root length, specific root length (SRL) and topological index (TI), compared to barnyardgrass grown in monoculture; moreover, there was a significant correlation of topological index with root foraging precision and competition. Therefore, the presence of allelopathic rice roots affected the barnyardgrass root morphology, nutrient foraging and competition, suggesting that allelopathy plays a key role in root recognition behaviour of barnyardgrass–rice competitive interaction.