M. Z. I. H. Tuhin, T. I. Anee, N. Ahmed, Mira Rahman, Khussboo Rahman, M. Hasanuzzaman
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引用次数: 0
Abstract
An experiment was conducted to investigate the effect of different levels of cadmium (Cd) stress on germination, morphology, physiology and yield of rice. There were five treatments, viz. control (no Cd), 0.5 mM CdCl2, 1 mM CdCl2, 1.5 mM CdCl2 and 2 mM CdCl2, carried out by a randomized complete block design (RCBD) with three replications. Cadmium stress caused a significant reduction of plant height and tillers hill-1 in a dose-dependent manner. The highest decline of relative water content and SPAD value was found at 1.5 mM (11 and 16%) and 2 mM (14 and 19%) Cd stress compared to the control. The number of effective tillers hill-1, filled grains panicle-1, 1000-grain weight, length of panicle, grain yield and straw yield reduced significantly by 44, 32, 15, 24, 37 and 45%, respectively, over the control. Germination and seedling-related parameters were recorded 10 days after germination. The lowest germination percentage (27%), germination index (27%) and seedling vigour index (49%) were observed at the highest level of Cd stress in comparison to the control. Cadmium stress resulted in maximum abnormal seedlings and markedly reduced length of root and shoot as well as their fresh and dry weight. Root shoot ratio showed differential responses to Cd stress. Thus, it can be concluded that a higher level of Cd in soil has a detrimental effect on seed germination, morphology, physiology and yield of rice.
通过试验研究了不同镉胁迫对水稻萌发、形态、生理和产量的影响。5个处理,即对照(无Cd)、0.5 mM CdCl2、1 mM CdCl2、1.5 mM CdCl2和2 mM CdCl2,采用随机完全区组设计(RCBD), 3个重复。镉胁迫导致植株高度和分蘖hill-1显著降低,且呈剂量依赖性。与对照相比,1.5 mM(11%和16%)和2 mM(14%和19%)Cd胁迫下相对含水量和SPAD值下降幅度最大。有效分蘖数、穗数-1、千粒重、穗长、籽粒产量和秸秆产量分别较对照显著减少44、32、15、24、37和45%。在萌发后10天记录发芽和幼苗相关参数。与对照相比,最高镉胁迫下的发芽率(27%)、发芽指数(27%)和幼苗活力指数(49%)最低。镉胁迫导致异常苗数量最多,根、梢长、鲜重和干重显著减少。根冠比对Cd胁迫表现出不同的响应。因此,土壤中较高的镉水平对水稻种子萌发、形态、生理和产量都有不利影响。
期刊介绍:
Contributii Botanice is an international, peer-reviewed journal publishing scientifically sound papers in the fields of Plant Systematics, Phytosociology, Plant Physiology and Morphology, Plant Ecology, Population Ecology, Ecosystem Ecology, Phytogeography, Phytopathology, Microbiology, Paleobotany, Plant Conservation and Cell/Molecular Plant Biology. Papers of mostly taxonomic nature or focussed on floristics and phytosociology will only be considered if they exceed the pure descriptive approach and have relevance interpreting patterns in the above mentioned plant sciences.