Changes in Metabolites and Allelopathic Effects of Non-Pigmented and Black-Pigmented Lowland Indica Rice Varieties in Phosphorus Deficiency  

作　　者：Liyana SARA Sompop SAEHENG Panupong PUTTARAK Lompong KLINNAWEE 

机构地区：[1]Division of Biological Science,Faculty of Science,Prince of Songkla University,Songkhla 90110,Thailand [2]Division of Health and Applied Sciences,Faculty of Science,Prince of Songkla University,Songkhla 90110,Thailand [3]Plant Cell and Physiology for Sustainable Agriculture Research Unit,Faculty of Science,Prince of Songkla University,Songkhla 90110,Thailand [4]Department of Pharmacognosy and Pharmaceutical Botany,Faculty of Pharmaceutical Sciences,Prince of Songkla University,Songkhla 90110,Thailand [5]Phytomedicine and Pharmaceutical Biotechnology Excellence Center,Prince of Songkla University,Songkhla 90110,Thailand

出　　处：《Rice science》2024年第4期434-448,I0025,I0026,共17页水稻科学（英文版）

基　　金：supported by the National Science Research and Innovation Fund and Prince of Songkla University, Thailand (Grant No. SCI6601035S);a Graduate Fellowship from the Faculty of Science, Prince of Songkla University, Thailand (Grant No. 1-2565-02-017)。

摘　　要：Phosphorus(P) levels alter the allelopathic activity of rice seedlings against lettuce seeds. In this study, we investigated the effect of P deficiency on the allelopathic potential of non-pigmented and pigmented rice varieties. Rice seedlings of the white variety Khao Dawk Mali(KDML105, non-pigmented) and the black varieties Jao Hom Nin(JHN, pigmented) and Riceberry(RB, pigmented) were cultivated under high P(HP) and low P(LP) conditions. Morphological and metabolic responses to P deficiency were investigated. P deficiency inhibited shoot growth but promoted root growth of rice seedlings in all three varieties. Moreover, P deficiency led to decreased cytosolic phosphate(Pi) and total P concentrations in both shoot and root tissues. The subsequent reduction in internal P concentration enhanced the accumulation of phenolic compounds in both shoot and root tissues of the seedlings. Subsequently, allelopathy-based inter-and intra-specific interactions were assessed using water extracts from seedlings of the three varieties grown under HP and LP conditions. These extracts were tested on seeds of lettuce, the weed Dactyloctenium aegyptium, and the same rice variety. The shoot and root extracts from P-deficient seedlings reduced the germination of all recipient plants. Specifically, the shoot extract from P-deficient KDML105 seedlings reduced the germination index(GI) of lettuce seeds to 1%, while those from P-deficient RB and JHN seedlings produced GIs of 32% and 42%, respectively. However, when rice seeds were exposed to their own LP shoot and root extracts, their GIs increased up to 4-fold, compared with the HP extracts. Additionally, the shoot extracts from P-deficient plants also stimulated the germination of D. aegyptium by about 2–3-fold, whereas the root extracts did not have this effect. Therefore, P starvation led to the accumulation and exudation of phenolics in the shoots and roots of rice seedlings, altering their allelopathic activities. To adapt to P deficiency, rice seedlings potentially release signa

关 键 词：phosphorus deficiency non-pigmented and black-pigmented rice phenolics extract ALLELOPATHY 

分 类 号：S511.21[农业科学—作物学]