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Changes in Metabolites and Allelopathic Effects of non-pigmented and black-pigmented Lowland Indica rice Varieties in Phosphorus Deficiency

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rice science 2024年第4期31卷 434-448,I0025,I0026页

作者： Liyana SARA Sompop SAEHENG Panupong PUTTARAK Lompong KLINNAWEE Division of Biological Science Faculty of SciencePrince of Songkla UniversitySongkhla 90110Thailand Division of Health and Applied Sciences Faculty of SciencePrince of Songkla UniversitySongkhla 90110Thailand Plant Cell and Physiology for Sustainable Agriculture Research Unit Faculty of SciencePrince of Songkla UniversitySongkhla 90110Thailand Department of Pharmacognosy and Pharmaceutical Botany Faculty of Pharmaceutical SciencesPrince of Songkla UniversitySongkhla 90110Thailand Phytomedicine and Pharmaceutical Biotechnology Excellence Center Prince of Songkla UniversitySongkhla 90110Thailand

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 defici

关键词： phosphorus deficiency non-pigmented and black-pigmented rice phenolics extract allelopathy

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