Oxalate and tannins assessment in Atriplex halimus L. and A. nummularia L.

Journal of Range Management Pub Date : 2003-07-01 DOI:10.2307/4004041

M. Abu-Zanat, F. M. Al-Hassanat, M. Alawi, G. Ruyle

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引用次数: 20

Abstract

The study was conducted at 3 locations in the arid region of Jordan to assess the seasonal changes of oxalate and tannins in Atriplex halimus L. and A. nummularia L. plants commonly used for revegetation of degraded rangelands. During spring and fall seasons, 20 shrubs of each species were selected randomly at each location, 20 similar twigs per shrub were clipped and analyzed for oxalate and tannins. Atriplex halimus contained higher levels of oxalate (7.00%) compared with A. nummularia plants (6.20%) (P < 0.001). Oxalate levels averaged 8.29 and 4.92% in spring and fall season, respectively. Plants of A. halimus accumulated more oxalate in spring than those of A. nummularia. Clipping had no effect on oxalate concentration. The seedlings of A. nummularia contained more oxalate than old plants whereas old shrubs of A. halimus contained more oxalate than the young seedlings. The browse of A. halimus contained more condensed and hydrolyzable tannins (1.05% and 0.67%, P < 0.0001) than A. nummularia (0.80% and 0.39%, P < 0.0001), respectively. Clipping had no effect on the levels of tannic phenols, condensed and hydrolyzable tannins. Young plants of the 2 species had higher levels of condensed tannins compared to older plants. However, seedlings of A. nummularia contained significantly higher levels of condensed tannins compared to A. nummularia seedlings (1.57% and 1.47%, respectively). Atriplex halimus synthesized more oxalate, tannic phenols, condensed and hydrolyzable tannins than A. nummularia. These secondary metabolites may explain the low palatability of Atriplex halimus compared to A. nummularia. DOI:10.2458/azu_jrm_v56i4_abu-zanat

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盐柳和麻柳中草酸盐和单宁含量的评价。

本研究在约旦干旱区的3个地点，对退化牧地复植中常用的盐柳和金银花植物草酸盐和单宁的季节变化进行了评价。在春季和秋季，在每个地点随机选取20株灌木，每株灌木剪下20株相似的枝条，分析草酸盐和单宁含量。草酸盐的含量(7.00%)高于黄刺蒿(6.20%)(P < 0.001)。春秋季草酸盐平均含量分别为8.29%和4.92%。在春季，盐柳草植株的草酸盐积累量要高于nummularia植株。修剪对草酸盐浓度没有影响。金针蒿幼苗草酸含量高于老植株，而金针蒿老灌木草酸含量高于幼苗。酸麻的浓缩单宁含量为1.05%，水解单宁含量为0.67%，P < 0.0001;酸麻的浓缩单宁含量为0.80%，水解单宁含量为0.39%，P < 0.0001;剪切对单宁酚、浓缩和水解单宁的水平没有影响。两种植物的幼株与老株相比，浓缩单宁含量较高。然而，金麻花幼苗的浓缩单宁含量显著高于金麻花幼苗(分别为1.57%和1.47%)。盐柳草合成的草酸盐、单宁酚、缩合单宁和可水解单宁含量均高于nummularia。这些次生代谢物可能解释了为什么盐柳的适口性较低。DOI: 10.2458 / azu_jrm_v56i4_abu-zanat

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Journal of Range Management

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