[1]李春华,汪吉东,张辉,等.磷缺乏对不同甘薯品种根系生长及磷素吸收的影响[J].江苏农业学报,2019,(01):91-95.[doi:doi:10.3969/j.issn.1000-4440.2019.01.013]
　LI Chun-hua,WANG Ji-dong,ZHANG Hui,et al.Responses of root growth and phosphorus uptake for sweet potatoes under low phosphorus supply[J].,2019,(01):91-95.[doi:doi:10.3969/j.issn.1000-4440.2019.01.013]
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磷缺乏对不同甘薯品种根系生长及磷素吸收的影响()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2019年01期
页码:
91-95
栏目:
耕作栽培·资源环境
出版日期:
2019-02-26

文章信息/Info

Title:
Responses of root growth and phosphorus uptake for sweet potatoes under low phosphorus supply
作者:
李春华; 汪吉东; 张辉; 张永春
（江苏省农业科学院农业资源与环境研究所/农业部江苏耕地保育科学观测实验站，江苏南京210014）
Author(s):
LI Chun-hua; WANG Ji-dong; ZHANG Hui; ZHANG Yong-chun
(Institute of Agricultural Resources and Environment， Jiangsu Academy of Agricultural Sciences/Scientific Observing and Experimental Station for Farmland Conservation (Jiangsu), Ministry of Agriculture, Nanjing 210014, China)
关键词:
甘薯; 低磷; 根系; 生物量; 磷吸收
Keywords:
sweet potato; phosphorus deficiency; root; dry matter; phosphorus uptake
分类号:
S531.062
DOI:
doi:10.3969/j.issn.1000-4440.2019.01.013
文献标志码:
A
摘要:
为研究不同甘薯品种生育前期对磷素（P）缺乏的生长响应特征，以苏薯11（S11）和苏薯17（S17）为试验材料，设置低磷和施磷2个处理，采用土柱培养法在移栽后35 d分析和测定甘薯根系形态、磷吸收量、土壤有效磷含量及磷酸酶活性。结果显示：（1）与施磷处理相比，低磷处理降低了甘薯的生物量，其中苏薯11单株生物量降幅达19.5%（P<0.05）；此外，苏薯11的比根长和比表面积在低磷处理下显著增加，增幅分别达到41.8%（P<0.05）和50.9%（P<0.05）；虽然苏薯17单株生物量降幅不显著，但比根长在低磷处理下显著增加49.6%（P<0.05）。（2）低磷处理降低了甘薯对磷的吸收，苏薯11体内磷积累量降幅大于苏薯17；增施磷肥后促进了苏薯11对磷的吸收，导致其磷总积累量高于苏薯17。（3）与苏薯17相比，低磷处理提高了苏薯11土壤中的磷酸酶活性；同一处理下种植2个品种甘薯的土壤中有效磷含量基本持平。可见，磷素缺乏抑制了甘薯生育前期的生长及其对磷素的吸收，其中苏薯11对低磷胁迫的响应大于苏薯17。
Abstract:
To study the response characteristics of sweet potatoes exposed to the phosphorus (P) deficiency at the early growth period, a soil column experiment was conducted with two sweet potato varieties, Sushu11 (S11) and Sushu17 (S17), under P deficiency and P sufficiency. And the root morphology, P uptake, soil available P content and phosphatase activity of sweet potatoes were determined at 35 days after transplanting. The results showed that P deficiency inhibited the total dry matter (DM) of sweet potatoes, with significant （P<0.05） reduction in S11 (19.5%) compared with that under P sufficiency. Besides, significant （P<0.05） increments for the specific root length (41.8%) and specific root surface area of S11 (50.9%) were observed.The specific root length of S17 was also increased significantly（P<0.05） with 49.6% induced by P deficiency although no significant reduction existed in the total DM. P uptake was decreased and larger reduction of P accumulation in S11 was detected than that in S17 treated by the P deficiency. Whereas, total P accumulation of S11 was higher than that of S17 when increasing the phosphorus fertilizer. For S11, the soil phosphatase activity was enhanced under the P deficiency when compared to S17. However, the contents of available P in soil planted the S11 and S17 were similar under the same P treatment. In conclusion, P deficiency inhibited the growth and P uptake of sweet potatoes at the early period and S11 was more sensitive to P deficiency than S17.

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备注/Memo

备注/Memo:
收稿日期：2018-09-26 基金项目：江苏省博士后科研资助计划项目（2018K033A）；现代农业产业体系专项（CARS-10-B-9）；江苏省农业科技自主创新基金项目[CX (17)-1001] 作者简介：李春华(1986-)，女，山东泰安人，博士，助理研究员，主要从事植物生理与营养研究， (E-mail)791508481@qq.com 通讯作者：张永春，(E-mail)yczhang66@sina.com
更新日期/Last Update: 2019-02-27