Saini Poonam, Khan Suphiya, Baunthiyal Mamta, Sharma Vinay
J Environ Biol. 2013 Mar;34(2):205-9.
Prosopis juliflora (Mimosoideae) is a fast growing and drought resistant tree of semi-arid region of India where fluoride (F) toxicity is a common problem. In the present investigations this species was fluoride tested to check their capacity as bioindicator plant and its efficiency to accumulate. To achieve this aim, P. juliflora seedlings grown in hydroponic culture containing different concentrations of F were analyzed for germination percentage together with some biochemical parameters viz, antioxidant enzyme activities, total chlorophyll and accumulation of F in different plant parts. After 15 days of treatment, root growth (r = -0.928, p < 0.01), shoot growth (r = -0.976, p < 0.01), vigor index (r = -0.984, p < 0.01) were in decreasing trend with increasing concentration of NaF. Both catalase (3.2 folds) and peroxidase (2.7 folds) enzymes activity increased with increase in F concentration. Plant accumulated larger portion of the F in the roots (1024.63 microg g(-1) d.wt.) followed by shoot (492.30 microg g(-1) d.wt.). As P. juliflora did not show any morphological changes (marginal and tip chlorosis of leaf portions, necrosis and together these features are referred to as leaf "tip-burn") therefore, this species may be used as suitable bioindicator species for potentially F affected areas. Further, higher accumulation of F in roots indicates that P. juliflora is a suitable species for the removal of F in phytoremediation purposes.
牧豆树（含羞草科）是印度半干旱地区一种生长迅速且耐旱的树木，在该地区氟（F）中毒是一个常见问题。在本研究中，对该物种进行了氟测试，以检查其作为生物指示植物的能力及其积累效率。为实现这一目标，分析了在含有不同浓度氟的水培溶液中生长的牧豆树幼苗的发芽率以及一些生化参数，即抗氧化酶活性、总叶绿素含量以及氟在不同植物部位的积累情况。处理15天后，随着氟化钠浓度的增加，根生长（r = -0.928，p < 0.01）、茎生长（r = -0.976，p < 0.01）、活力指数（r = -0.984，p < 0.01）呈下降趋势。过氧化氢酶（3.2倍）和过氧化物酶（2.7倍）的活性均随氟浓度的增加而升高。植物根部积累了大部分的氟（1024.63微克/克干重），其次是地上部分（492.30微克/克干重）。由于牧豆树未表现出任何形态变化（叶片边缘和尖端黄化、坏死，这些特征统称为叶片“叶烧”），因此，该物种可作为潜在氟污染地区合适的生物指示物种。此外，根部较高的氟积累表明牧豆树是用于植物修复去除氟的合适物种。
