| 内生真菌和丛枝菌根真菌互作对醉马草幼苗生长和镉耐性的影响 |
| |
| 引用本文： | 赵振锐,钟睿,张兴旭.内生真菌和丛枝菌根真菌互作对醉马草幼苗生长和镉耐性的影响[J].草业科学,2020(3):432-443. |
| |
| 作者姓名： | 赵振锐 钟睿 张兴旭 |
| |
| 作者单位： | 兰州大学草地农业生态系统国家重点实验室/兰州大学草地农业科技学院 |
| |
| 基金项目： | 国家自然科学基金(31772665)。 |
| |
| 摘 要： | 本研究通过接种土壤从枝菌根(arbuscular mycorrhizal,AM)真菌孢子,探讨了在温室盆栽条件下,甘肃内生真菌(Epichlo?gansuensis)在不同重金属镉(Cd^2+)离子胁迫下对醉马草(Achnatherum inebrians)根系AM真菌侵染率的影响,以及内生真菌、Cd^2+和AM真菌三者互作对醉马草幼苗生长的影响。结果表明,Cd^2+和内生真菌互作对醉马草菌根侵染率无显著(P>0.05)影响,菌根侵染率随着Cd^2+浓度的增加呈现先升后降的趋势,在高浓度Cd2+(0.9 mmol·L^-1)条件下,内生真菌侵染(endophyte-infected,EI)的醉马草植株菌根侵染率显著(P<0.05)高于不带菌(endophyte-free,EF)的植株。低浓度Cd2+(0.3 mmol·L^-1)显著(P<0.05)促进了醉马草的生长,而高浓度Cd^2+(0.9 mmol·L^-1)条件下显著(P<0.05)抑制了醉马草的生长;内生真菌在高浓度Cd^2+(0.9 mmol·L^-1)胁迫条件下能够减轻其对醉马草的伤害;接种AM真菌显著(P<0.05)促进醉马草地上部分生长的同时显著(P<0.05)抑制了其根系的生长;三者互作显著(P<0.05)促进醉马草叶绿素含量和地上鲜重,但显著(P<0.05)抑制了醉马草根长。以上结果表明,内生真菌和Cd2+均能影响AM真菌对醉马草根系的侵染,但二者无互作效应,内生真菌、AM真菌和Cd2+三者互作会影响醉马草幼苗地上和地下生长。
|
| 关 键 词： | 内生真菌 镉 醉马草 AM真菌 菌根侵染率 幼苗生长 |
Effects of interaction of Epichloe gansuensis and arbuscular mycorrhizal fungi on the seedling growth and cadmium(Cd)tolerance of Achnatherum inebrians |
| |
| ZHAO Zhenrui,ZHONG Rui,ZHANG Xingxu.Effects of interaction of Epichloe gansuensis and arbuscular mycorrhizal fungi on the seedling growth and cadmium(Cd)tolerance of Achnatherum inebrians[J].Pratacultural Science,2020(3):432-443. |
| |
| Authors: | ZHAO Zhenrui ZHONG Rui ZHANG Xingxu |
| |
| Institution: | (State Key Laboratory of Grassland Agro-ecosystems/College of Pastoral Agricultural Science and Technology,Lanzhou University,Lanzhou 730020,Gansu,China) |
| |
| Abstract: | The present study was conducted to measure the colonization rate of arbuscular mycorrhizal(AM)fungi under different growth conditions and to analyze the effects of interaction between Epichlo?gansuensis,AM fungi,and Cd^2+on the growth of Achnatherum inebrians seedlings.The results indicated that colonization rate of AM fungi increased first and then decreased with the increase of Cd^2+concentration.AM fungi colonization rate of endophyte-infected(EI)A.inebrians was significantly(P<0.05)higher than that of endophyte-free(EF)A.inebrians under a high concentration(0.9 mmol·L^-1)Cd2+.However,the interaction of Cd and E.gansuensis had no significant(P>0.05)effect on AM fungi colonization rate.Low Cd2+concentration(0.3 mmol·L^-1)significantly(P<0.05)promoted plant growth,whereas high Cd^2+concentration(0.9 mmol·L^-1)significantly(P<0.05)inhibited plant growth.E.gansuensis significantly(P<0.05)alleviated the damage to host plants under a high Cd^2+concentration(0.9 mmol·L^-1).AM fungi significantly(P<0.05)promoted aboveground growth but significantly(P<0.05)inhibited belowground growth.The interaction of the three factors significantly(P<0.05)promoted chlorophyll content and aboveground fresh weight,but significantly inhibited root length(P<0.05).These results showed that both E.gansuensis and Cd2+affected AM fungi colonization rate,but there was no interaction between them,and the interaction between these three factors affected the growth of A.inebrians seedlings aboveground and belowground. |
| |
| Keywords: | Epichloe gansuensis Cd2+ Achnatherum inebrians AM fungi colonization rate seedling growth |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
