Interspecific Differences of the Root System Structures of Four Cereal Species as Affected by Soil Compaction

Japanese Journal of Crop Science

Yasuhiro KONO¹  Morio IIJIMA¹ 

关键词: Cereal root system structures;    イネ科作物の根系構造;    Interspecific differences;    機械的抵抗;    Lateral root development;    根系形態計測;    Mechanical impedance;    種間差;    Root system morphometry;    土壌圧縮;    Root extension rate;    側根発達;    Soil compaction;    土壌の物理的環境;    Soil physical environment;    根の伸長速度;   

DOI  :  10.1626/jcs.60.130

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Comparison of the root system structures of four cereal species as affected by soil compaction was conducted morphometrically. Plants were grown under two different soil bulk densities of 1.33g/cm3 (control)and 1.50g/cm3 (compact) for two weeks in the root box, and measurements were made on the number, length and diameter of all the roots from every component of the root system. Promoted or less restricted growth was recognized in the mean length and number of higher order laterals in every species under compact treatments. The increased occurrence of L-type lateral roots in the compact treatment contributed to the promoted growth of higher order laterals. Compared to upland rice and Job's tears, sorghum and maize showed higher restriction in both shoot and root growth. As for the occurrence ratio of L-type laterals in the compact treatment, the former two species had 1.5 to 3 times that of the latter two species. Regardless of root diameter, the species with longer root length showed higher restriction of total root length in both 1st and 2nd order laterals. It was suggested that the ability to produce L-type laterals and extension rate of each order lateral roots were closely related to root growth responses under mechanically impeded soil conditions.

【 授权许可】

Unknown