摘要
以草莓‘红颜’品种为试材,设缺K(K+48.75 mg.L-1,缺量水平)、1/2K(K+415.58 mg.L-1,半量水平)和全量K(K+782.41 mg.L-1,正常水平)营养液处理,对缺钾胁迫与草莓连作障碍的关系进行了探讨。结果表明,缺钾处理显著抑制二茬草莓植株地下部分和地上部分的生长,其中缺K的长势最弱,1/2K比全量K的长势强;缺K二茬植株根系分泌物对草莓组培苗生长有显著影响,表现为低浓度(1%、2%)根系分泌物促进幼苗侧根和茎叶生长,高浓度(4%)则抑制根系生长。不同浓度钾营养液处理的三茬植株分别接种尖孢镰刀菌和大丽轮枝菌后,在不同时期比未经过连作的基质对照发病都严重。缺K三茬植株发病最重,接菌后10 d时病情指数就高达75,全量K三茬植株发病次之,1/2K三茬植株发病相对较轻。因此,缺K环境会加重草莓的连作障碍,适宜的K量对草莓连作障碍的防治有重要意义。
Use strawberry cultivar ＇Benihoppe＇ as test material. The purpose of this study was to investigate the relations of K-deficiency stress with continuous cropping obstacles of strawberry. The results showed that the growth of shoot and root was inhibited, when strawberry plants were replanted in first-crop substrates with K-deficiency （K＋ 48.75 mg·L-1）, 1/2K （K＋ 415.58 mg·L-1） and normal K （K＋ 782.41 mg·L-1） treatments compared with control group. The plants with K-deficiency treatment had the worst growth, while the growth of plants with 1/2K treatment was better than that with 1K treatment. Root exudates of second-crop plants with K-deficiency treatment had a significant influence on growth of the tissue cultural plantlets. The low concentration （ 1%, 2%） promoted laterals growth and shoot growth and high concentration （4%） inhibited root growth. When second-crop substrates were used to replant strawberry plants and inoculated by Fusarium oxysporum and Verticillium dahliae, the diseases of third-crop strawberry plants were worse at different periods than that of control group. The disease of plants with K-deficiency treatment was the most serious, resulting in a 75 disease index after 10 days. 1/2K treatment had lower disease index than normal K treatment. In conclusion, continuous cropping obstacles of strawberry can be worse under the K-deficiency stress and appropriate K concentration had an important role in preventing continuous cropping obstacles.
出处
《园艺学报》
CAS
CSCD
北大核心
2013年第4期633-640,共8页
Acta Horticulturae Sinica
基金
教育部博士点基金项目(20110008130003)
农业部公益性行业项目(201003064)
关键词
草莓
缺钾胁迫
连作障碍
根系分泌物
组培苗
strawberry
K-deficiency stress
continuous cropping obstacle
root exudate
tissue cultural plantlet
