Premium
Isolation and identification of a potent allelopathic substance in rice root exudates
Author(s) -
KatoNoguchi Hisashi,
Ino Takeshi,
Sata Noriko,
Yamamura Shosuke
Publication year - 2002
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.2002.1150310.x
Subject(s) - allelopathy , lactuca , oryza sativa , lepidium sativum , seedling , biology , botany , bioassay , germination , biochemistry , genetics , gene
A search for growth inhibitors in rice root exudates was undertaken in order to clarify the allelopathic system in rice ( Oryza sativa L.). Rice seedlings inhibited the growth of cress ( Lepidium sativum L.) and lettuce ( Lactuca sativa L.) seedlings when the cress and lettuce were grown with rice seedlings. The putative compound causing the inhibitory effect of rice seedlings was isolated from their culture solution, and the chemical structure of the inhibitor was determined by spectral data as momilactone B. Momilactone B inhibited the growth of cress and lettuce seedlings at concentrations greater than 3 and 30 µ M , respectively. The concentration of momilactone B was 3.4 and 1.1 nmol per seedling in the culture solutions of husked and non‐husked rice seedlings, respectively. These results suggest that rice seedlings may release momilactone B into the environment and the stress caused by the husk‐treatment may increase the amount of momilactone B released. Thus, momilactone B may play an important role in rice allelopathy.