Wang Jiahao, Hu Die, Shi Xinning, Luo Jing, Ren Guangqian, Dai Zhicong, Qi Shanshan, Du Daolin
School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China.
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
Life (Basel). 2022 Jul 17;12(7):1069. doi: 10.3390/life12071069.
Invasive plants cause a global loss of biodiversity, pose a major threat to the environment and economy, and also significantly affect agricultural production and food security. Plant growth regulators (PGRs) are widely used in agricultural production and might also affect invasive weeds distributed around crops in various ways. At present, there are few studies concerning whether there are significant effects of PGRs on invasive weeds. In this study, two widely used PGRs in paddy fields, gibberellic acid (GA) and paclobutrazol (PAC), were applied on and a noxious weed , which is frequently distributed in paddy fields. The purpose of this study was to investigate if there are different responses of rice and weeds to these two plant regulators and the significant effects of PGRs on invasive weeds. The results showed that GA significantly promotes the total biomass of by 52.00%, but does not significantly affect that of . GA significantly increases the growth of aboveground and belowground , but not that of . On the other hand, PAC extremely inhibited the aboveground and belowground biomass of by more than 90%, but did not significantly inhibit the belowground biomass of . PAC also enhanced the leaf nitrogen content and chlorophyll content of , but not the traits of . Therefore, the effects of PGRs are significantly different between rice and the invasive weed. The potential promotion effects of PGRs on weeds that are frequently distributed in farmland warrant sufficient attention. This is probably one of the important reasons why invasive weeds can successfully invade the agricultural ecosystem with large human disturbance. This study might sound an alarm for weed control in paddy fields.
入侵植物导致全球生物多样性丧失，对环境和经济构成重大威胁，还显著影响农业生产和粮食安全。植物生长调节剂（PGRs）在农业生产中广泛使用，也可能以多种方式影响作物周围分布的入侵杂草。目前，关于植物生长调节剂对入侵杂草是否有显著影响的研究较少。在本研究中，将两种稻田中广泛使用的植物生长调节剂，赤霉素（GA）和多效唑（PAC），施用于一种经常分布在稻田中的有害杂草上。本研究的目的是调查水稻和杂草对这两种植物调节剂是否有不同反应，以及植物生长调节剂对入侵杂草的显著影响。结果表明，GA显著促进了该杂草总生物量增加52.00%，但对水稻总生物量没有显著影响。GA显著增加了该杂草地上和地下部分的生长，但对水稻没有影响。另一方面，PAC极大地抑制了该杂草地上和地下生物量超过90%，但对水稻地下生物量没有显著抑制作用。PAC还提高了该杂草的叶片氮含量和叶绿素含量，但对水稻的这些性状没有影响。因此，植物生长调节剂对水稻和入侵杂草的影响存在显著差异。植物生长调节剂对农田中常见杂草的潜在促进作用值得充分关注。这可能是入侵杂草能够在人类干扰较大的农业生态系统中成功入侵的重要原因之一。本研究可能为稻田杂草防治敲响警钟。
