A hydroponics experiment was conducted to investigate the rice root growth in FACE （free-air carbon dioxide enrichment）. The root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diam...A hydroponics experiment was conducted to investigate the rice root growth in FACE （free-air carbon dioxide enrichment）. The root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter significantly increased under FACE conditions, while the CO2 enrichment decreased the N concentration in rice roots without any change in the C content, leading to an increase in root C：N ratio. Moreover, the elevated CO2 resulted in a remarkable decrease of root activity, expressed as per unit root dry weight, which might be responsible for decreased N concentration in roots.展开更多
采用营养液培养法,研究了不同Zn浓度(0,0.25,0.50,1.00,2.00 mm o l/L)对黑麦草幼苗生长、过氧化物酶活性、脯氨酸、根系活力及Zn吸收的影响。结果表明,低锌胁迫对黑麦草幼苗生长无抑制,过度锌胁迫(Zn≥2 mm o l/L)将降低黑麦草地上部...采用营养液培养法,研究了不同Zn浓度(0,0.25,0.50,1.00,2.00 mm o l/L)对黑麦草幼苗生长、过氧化物酶活性、脯氨酸、根系活力及Zn吸收的影响。结果表明,低锌胁迫对黑麦草幼苗生长无抑制,过度锌胁迫(Zn≥2 mm o l/L)将降低黑麦草地上部干质量。幼苗叶内游离脯氨酸含量随锌胁迫时间、锌浓度增加而增加。随Zn胁迫时间增加幼苗POD活性先降后升、根系活力先升后降,锌处理的植株地上部POD活性随锌浓度增加先降低,然后增加,而根系活力随锌浓度增加而增加。黑麦草幼苗地上部和根系Zn含量随Zn浓度的增加而增加,当Zn浓度为2.00 mm o l/L时,地上部Zn含量最大值为775.0 m g/kg。展开更多
在温室中用 PEG 模拟干旱胁迫,比较了内生真菌感染(EI)和非感染(EF)的高羊茅(Festuca arundi-nacea Schreb.cv.Millennium)种群的几项与水分生理相关的指标.结果表明在对照和轻度胁迫时,EI 植株的分蘖、叶长、渗透势、游离脯氨酸含量及...在温室中用 PEG 模拟干旱胁迫,比较了内生真菌感染(EI)和非感染(EF)的高羊茅(Festuca arundi-nacea Schreb.cv.Millennium)种群的几项与水分生理相关的指标.结果表明在对照和轻度胁迫时,EI 植株的分蘖、叶长、渗透势、游离脯氨酸含量及生物量与 EF 种群相比都没有显著差异;重度胁迫条件下,复水后 EI 植株叶片展开程度明显大于 EF 植株,根系活力显著高于 EF 植株(P<0.05),说明重度干旱胁迫下内生真菌感染对高羊茅的恢复生长有一定的增益作用.展开更多
基金National Natural Science Foundation of China （nos. 40231003 , 40110817） Knowledge Innovation Program of Chinese Academy of Sciences （no. KZCX2-408） the National Key Project on Basic Sciences （no. 2002CB714003）.
文摘A hydroponics experiment was conducted to investigate the rice root growth in FACE （free-air carbon dioxide enrichment）. The root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter significantly increased under FACE conditions, while the CO2 enrichment decreased the N concentration in rice roots without any change in the C content, leading to an increase in root C：N ratio. Moreover, the elevated CO2 resulted in a remarkable decrease of root activity, expressed as per unit root dry weight, which might be responsible for decreased N concentration in roots.
文摘采用营养液培养法,研究了不同Zn浓度(0,0.25,0.50,1.00,2.00 mm o l/L)对黑麦草幼苗生长、过氧化物酶活性、脯氨酸、根系活力及Zn吸收的影响。结果表明,低锌胁迫对黑麦草幼苗生长无抑制,过度锌胁迫(Zn≥2 mm o l/L)将降低黑麦草地上部干质量。幼苗叶内游离脯氨酸含量随锌胁迫时间、锌浓度增加而增加。随Zn胁迫时间增加幼苗POD活性先降后升、根系活力先升后降,锌处理的植株地上部POD活性随锌浓度增加先降低,然后增加,而根系活力随锌浓度增加而增加。黑麦草幼苗地上部和根系Zn含量随Zn浓度的增加而增加,当Zn浓度为2.00 mm o l/L时,地上部Zn含量最大值为775.0 m g/kg。
文摘在温室中用 PEG 模拟干旱胁迫,比较了内生真菌感染(EI)和非感染(EF)的高羊茅(Festuca arundi-nacea Schreb.cv.Millennium)种群的几项与水分生理相关的指标.结果表明在对照和轻度胁迫时,EI 植株的分蘖、叶长、渗透势、游离脯氨酸含量及生物量与 EF 种群相比都没有显著差异;重度胁迫条件下,复水后 EI 植株叶片展开程度明显大于 EF 植株,根系活力显著高于 EF 植株(P<0.05),说明重度干旱胁迫下内生真菌感染对高羊茅的恢复生长有一定的增益作用.
