丛枝菌根真菌和磷水平对番茄幼苗侧根形成的影响

应用生态学报

丛枝菌根真菌和磷水平对番茄幼苗侧根形成的影响

江夏¹,陈伟立¹,徐春香¹,朱红惠²,姚青^1**

(¹华南农业大学园艺学院, 广州 510642; ²广东省微生物研究所/广东省菌种保藏与应用重点实验室/广东省微生物应用新技术公共实验室/省部共建华南应用微生物国家重点实验室, 广州 510070)

出版日期:2015-04-18 发布日期:2015-04-18

Influences of arbuscular mycorrhizal fungus and phosphorus level on the lateral root formation of tomato seedlings.

JIANG Xia¹, CHEN Wei-li¹, XU Chun-xiang¹, ZHU Hong-hui², YAO Qing¹

(¹College of Horticulture, South China Agricultural University, Guangzhou 510642, China; ^2Guangdong Institute of Microbiology/Guangdong Provincal Key Laboratory of Microbial Culture Collection and Application/Guangdong Open Laboratory of Applied Microbiology/State Key Laboratory of Applied Microbiology (MinistryGuangdong Province Jointly Breeding Base), South China, Guangzhou 510070, China)

Online:2015-04-18 Published:2015-04-18

摘要/Abstract

摘要：

为了探讨丛枝菌根真菌(AMF)和磷水平对植物根系构型的影响,在两个磷水平下对番茄幼苗接种AMF菌株Rhizophagus irregularis BGC JX04B,研究AMF和磷水平对番茄幼苗侧根形成的影响.结果表明: AMF对植株生物量的促进效应不明显,但显著降低了植株的根冠比;显著增加了主根长而减少了1级侧根长,并与侵染时期存在互作;显著降低了2～3级侧根数量及2级侧根数与1级侧根数的比值，对1~2级侧根密度无显著影响.高磷(50 mg·kg^-1P)显著促进了植株生长,降低了植株的根冠比;对主根长和1级侧根长无显著影响,显著增加了1~3级侧根数量及2级侧根数与1级侧根数的比值,提高了1~2级侧根密度.表明AMF和磷水平对番茄侧根形成的影响机制不同,高磷的影响可能基于对养分吸收和生长的促进效应,而AMF的影响则更为复杂,且AMF与侵染时期的互作效应预示着碳素分配(糖信号)可能参与了AMF对根系构型的调控.

Abstract: To explore the influences of arbuscular mycorrhizal fungi (AMF) and P level on plant root system architecture, tomato seedlings were inoculated with AMF strain Rhizophagus irregularis BGC JX04B under two P levels, and the influences of AMF and P level on lateral root (LR) formation of tomato seedlings were studied. Results indicated that the promoting effect of AMF on plant biomass was not evident, but significantly decreased the root to shoot ratio of plants. AMF significantly increased the primary root length but decreased the 1^st order LR length and interacted with the mycorrhizal colonization period. AMF significantly lowered the 2^nd-3^rd order LR number and the ratio of 2^nd order LR number to 1^st order LR number, but did not significantly affect the 1^st-2^nd order LR density. High P level (50 mg·kg^-1 P) significantly promoted the plant growth and decreased the root to shoot ratio of plants. It had no significant effect on the primary root length and the 1st order root length, but significantly enhanced the 1^st-3^rd order LR number and the ratio of 2^nd order LR number to 1^st order LR number, increased the 1^st-2^nd order LR density. It suggested that AMF and P level did not share a common mechanism to influence the LR formation of tomato plants. The influence of high P level may depend on its promoting effects on nutrient uptake and plant growth, while the influence of AMF is more complex. Furthermore, the interaction between AMF and mycorrhizal colonization period implies the possible involvement of carbohydrate distribution (sugar signaling) in the regulation of root system architecture by AMF.

江夏1,陈伟立1,徐春香1,朱红惠2,姚青1**. 丛枝菌根真菌和磷水平对番茄幼苗侧根形成的影响[J]. 应用生态学报.

JIANG Xia1, CHEN Wei-li1, XU Chun-xiang1, ZHU Hong-hui2, YAO Qing1. Influences of arbuscular mycorrhizal fungus and phosphorus level on the lateral root formation of tomato seedlings.[J]. Chinese Journal of Applied Ecology.