生态环境学报
生態環境學報
생태배경학보
ECOLOGY AND ENVIRONMENT
2013年
5期
832-837
,共6页
史静%潘根兴%夏运生%张仕颖%张乃明
史靜%潘根興%夏運生%張仕穎%張迺明
사정%반근흥%하운생%장사영%장내명
镉%水稻%抗氧化酶系统
鎘%水稻%抗氧化酶繫統
력%수도%항양화매계통
cadmium%rice%antioxidant enzyme system
水稻Oryza sativa L.被认为是Cd吸收最强的大宗谷类作物,本研究采用网室盆栽实验研究2个籽粒镉积累水平不同的水稻品种(中浙优1号、高Cd品种和J196、低Cd品种),研究不同浓度Cd处理对水稻幼苗生长和抗氧化酶系统的影响。结果表明:高Cd水稻品种的Cd耐性高于低Cd水稻品种,表现为前者体内的MDA含量低于后者,而SOD、CAT、POD活性高于低Cd品种;在Cd胁迫下,高Cd品种的SOD 活性、CAT活性随Cd处理浓度增加先增后降,在10 mg·kg-1时达到峰值,POD活性则为先降后增,在Cd浓度为5 mg·kg-1时达到峰值;而低Cd品种随着外源Cd浓度增长,3种酶活性在25 mg·kg-1达到峰值,除SOD比对照降低外,CAT和POD分较对照升高38.07%和62.10%,表明在本试验处理下,Cd胁迫下,两品种中3种抗氧化酶保护作用不同,高Cd品种CAT的保护性最强,低Cd品种POD的保护作用最强。但本研究对两品种生长性状的研究却发现,高Cd品种的根系耐受指数及根系鲜质量显著低于低Cd品种,这可能和水稻对Cd的耐受原因多元化,且本实验条件下的Cd处理未产生植株生长抑制,Cd敏感品种自身的保护机制有关。
水稻Oryza sativa L.被認為是Cd吸收最彊的大宗穀類作物,本研究採用網室盆栽實驗研究2箇籽粒鎘積纍水平不同的水稻品種(中浙優1號、高Cd品種和J196、低Cd品種),研究不同濃度Cd處理對水稻幼苗生長和抗氧化酶繫統的影響。結果錶明:高Cd水稻品種的Cd耐性高于低Cd水稻品種,錶現為前者體內的MDA含量低于後者,而SOD、CAT、POD活性高于低Cd品種;在Cd脅迫下,高Cd品種的SOD 活性、CAT活性隨Cd處理濃度增加先增後降,在10 mg·kg-1時達到峰值,POD活性則為先降後增,在Cd濃度為5 mg·kg-1時達到峰值;而低Cd品種隨著外源Cd濃度增長,3種酶活性在25 mg·kg-1達到峰值,除SOD比對照降低外,CAT和POD分較對照升高38.07%和62.10%,錶明在本試驗處理下,Cd脅迫下,兩品種中3種抗氧化酶保護作用不同,高Cd品種CAT的保護性最彊,低Cd品種POD的保護作用最彊。但本研究對兩品種生長性狀的研究卻髮現,高Cd品種的根繫耐受指數及根繫鮮質量顯著低于低Cd品種,這可能和水稻對Cd的耐受原因多元化,且本實驗條件下的Cd處理未產生植株生長抑製,Cd敏感品種自身的保護機製有關。
수도Oryza sativa L.피인위시Cd흡수최강적대종곡류작물,본연구채용망실분재실험연구2개자립력적루수평불동적수도품충(중절우1호、고Cd품충화J196、저Cd품충),연구불동농도Cd처리대수도유묘생장화항양화매계통적영향。결과표명:고Cd수도품충적Cd내성고우저Cd수도품충,표현위전자체내적MDA함량저우후자,이SOD、CAT、POD활성고우저Cd품충;재Cd협박하,고Cd품충적SOD 활성、CAT활성수Cd처리농도증가선증후강,재10 mg·kg-1시체도봉치,POD활성칙위선강후증,재Cd농도위5 mg·kg-1시체도봉치;이저Cd품충수착외원Cd농도증장,3충매활성재25 mg·kg-1체도봉치,제SOD비대조강저외,CAT화POD분교대조승고38.07%화62.10%,표명재본시험처리하,Cd협박하,량품충중3충항양화매보호작용불동,고Cd품충CAT적보호성최강,저Cd품충POD적보호작용최강。단본연구대량품충생장성상적연구각발현,고Cd품충적근계내수지수급근계선질량현저저우저Cd품충,저가능화수도대Cd적내수원인다원화,차본실험조건하적Cd처리미산생식주생장억제,Cd민감품충자신적보호궤제유관。
Rice is concerned as a food crop that significantly accumulates Cd in grains. To examine the genotypic difference in the alternation of three antioxidative enzymes(SOD, POD and CAT) and the MDA contents, a pot experiment during the seeding period was conducted with two cultivars of hybrid rice, Zhongzheyou 1(high grain Cd accumulation) and J196 (high grain Cd accumulation), Cd was spiked at 0, 2.5, 5, 10, 20 mg/kg, respectively. The results showed that: Cd stress altered malondialdehyde (MDA) content and activities of superoxide dismutase (SOD), calase (CAT) and peroxidase (POD) in rice. Two rice cultivars responded differently to Cd stress in terms of MDA contents and antioxidant enzyme activity. Generally, the activities of SOD, CAT firstly ascend then droped with increase of Cd level, contrast to POD. While MDA contents would be more produced in J196, but SOD, CAT and POD tend to accumulate in Zhongzheyou 1. The higher MDA and less antioxidant enzyme contents were found in J196, indicating that J196 was more sensitive to Cd stress than Zhongzheyou 1.