Hossain M Alamgir, Ashrafuzzaman M, Hossain A K M Zakir, Ismail Mohd Razi, Koyama H
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh ; Institute of Tropical Agriculture, Universiti Putra Malaysia (UPM), 43400 Serdang, Selangor, Malaysia.
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh ; Laboratory of Cell Technology, Gifu University, Japan.
ScientificWorldJournal. 2014 Feb 20;2014:457187. doi: 10.1155/2014/457187. eCollection 2014.
Aluminum (Al) sensitive wheat cultivar kalyansona was grown for 14 d in a range of Ca solution (125, 625, and 2500 μM) plus other nutrients without Al. At 14 d after Ca treatment, half of these plants were harvested (H1), and the rest of the plants were exposed to 100 μM Al for additional 6 d and harvested (H2). Severe Al injury was found only in the plants with the lowest supply of Ca before Al treatment. Aluminum concentration in the apoplastic fluid was very high at 125 μM Ca probably because the plasma membrane of some of the cells was destroyed due to the attack of 100 μM Al. Aluminum content in roots decreased with increasing supply of Ca before Al treatment. Calcium content decreased drastically at harvest (H2) in the plants with 100 μM Al. Under Al stress conditions, the plant responded to Al in different ways due to not only the different Ca supply but also the variation of Ca content in the plant tissues. Actually, the plants having the largest Ca content in the roots before Al treatment can receive less Al injury during Al treatment. To substantiate this idea, a companion study was conducted to investigate the effects of 2500 μM Ca supply during, before, and after 100 μM Al treatment on root growth. The results indicated clearly that exogenous Ca supply before Al treatment is able to alleviate Al injury but less effective than Ca supply during Al treatment.
铝（Al）敏感小麦品种卡利安索纳在一系列钙溶液（125、625和2500 μM）加不含铝的其他养分条件下生长14天。在钙处理14天后，收获其中一半植株（H1），其余植株再暴露于100 μM铝中6天然后收获（H2）。仅在铝处理前钙供应最低的植株中发现严重的铝毒害。在125 μM钙时，质外体流体中的铝浓度非常高，这可能是因为部分细胞的质膜因100 μM铝的攻击而被破坏。在铝处理前，根中的铝含量随钙供应增加而降低。在收获时（H2），施加100 μM铝的植株中钙含量急剧下降。在铝胁迫条件下，植株对铝的反应不同，这不仅是因为钙供应不同，还因为植物组织中钙含量的变化。实际上，在铝处理前根中钙含量最高的植株在铝处理期间受到的铝毒害较小。为证实这一观点，开展了一项配套研究，以调查在100 μM铝处理期间、之前和之后供应2500 μM钙对根生长的影响。结果清楚地表明，在铝处理前供应外源钙能够减轻铝毒害，但效果不如在铝处理期间供应钙。
