摘要:

Dry matter yield and water uptake by barley (Hordeum vulgareL., cv. ‘Gus') and wheat(Triticum aestivumL., cv. ‘Inia 66') grown in full strength Hoagland nutrient solution were compared under three NaCl salinity levels in a growth chamber. Total dry matter yield decreased with increasing salinity for both plants, but wheat was more severely affected than barley at the high salinity level. Reduction in dry matter weights of barley and wheat were 57% and 67%, respectively, at the 1.2 MPa stress. Salt stress substantially decreased the number of tillers in both crops, however, this reduction was more severe for wheat than barley. The numbers of tillers were 10 and 7 for barley plants at 0.6 and 1.2 MPa stress, respectively. The respective values were 6 and 4 for wheat plants. Water uptake in both plants was substantially decreased by increasing salinity stress. This reduction was essentially similar for both plants. Water uptake per gram dry weight was not significantly affected by salt stress for barley. For wheat, only 1.2 MPa stress increased the amount of water absorbed per g dry matter produced.

ISSN:0190-4167    

DOI:10.1080/01904169109364206

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The relative amount of phytosiderophore produced by various Strategy II plants has been categorized as follows: barley (Hordeum vulgareL.) > wheat (Triticum aestivumL.) > oat (Avena byzantinaC. Koch.) > rye (Secale cerealeL.) >> corn (Zea maysL.) >> sorghum (Sorghum bicolor(L.) Moench) > rice (Oryza sativaL.). With the exception of rice, these plants developed under oxidized soil conditions, and the C‐3 species produce more phytosiderophore than C‐4 species under Fe‐deficiency stress. Iron‐efficient Coker 227 oat produced phytosiderophore in response to Fe‐deficiency stress, while Fe‐inefficient TAM 0–312 oat did not. Although Fe‐efficient WF9 corn and Fe‐inefficient ys1corn differed in their ability to obtain Fe, neither produced sufficient quantities of phytosiderophore to explain these differences. The objectives of this research were to determine: (a) if phytosiderophore production of Fe‐deficiency stressed C‐4 species millet (Panicum miliaceumL.) and corn is low or absent compared to identically stressed C‐3 species oat and barley, and (b) if native, inbred and hybrid corn cultivars differ in ability to produce and utilize phytosiderophores.

ISSN:0190-4167    

DOI:10.1080/01904169109364207

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Cucumber plants were grown hydroponically in three different nutrient solutions to determine the effect of NO3‐/NH4+ratio on several parameters. Top and root growth, CO2fixation, and ion content (K+, Ca+2, NO3‐) were always lower when urea and ammonium nitrate were the major N source as compared with a Hoagland solution in which nitrate was the major N source. No significant differences were found in total N and protein content among the three nutrient solution treatments.

ISSN:0190-4167    

DOI:10.1080/01904169109364208

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Wetland plant roots are often coated with iron oxides. The aim of this study was to determine if micro‐organisms growing in the rhizoplane affect the amount of iron oxide deposition. Methods were developed to compare axenic and non‐axenic rice plants grown in environmental chambers and exposed to solutions of ferrous iron. Axenic roots accumulated significantly (p < 0.05) more iron oxides than did non‐axenic roots.

ISSN:0190-4167    

DOI:10.1080/01904169109364209

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Construction, operation and maintenance of a new semi‐automated sand culture unit (NAUTILIS) for use with long‐term nutrition studies is described. The new design has three advantages: i) greater statistical validity is achieved primarily through randomization of individual experimental units within the system. Design blocking accounts for within greenhouse variation in environmental conditions. ii) nutrient solutions are recycled to treatment reservoirs to facilitate use of expensive isotopes such as15N. iii) semi‐automatic operation minimizes labor commitments to the experiment.

ISSN:0190-4167    

DOI:10.1080/01904169109364210

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The influence of low Cr III concentrations (0, 0.25, 0.5, and 1.0 μM as CrCl3–6H2O) on growth, chlorophyll and carotenoid content, the concentration of selected mineral nutrients (Fe, Mn, P), and Cr content was determined in both Fe‐control (10 μM Fe as Fe‐EDTA) and Fe‐deficient (no Fe supply) bush bean(Phaseolus vulgarisL.) plants grown hydroponically. Chromium significantly enhanced growth of both Fe‐control and Fe‐deficient plants. In Fe‐deficient plants, Cr significantly reduced chlorosis in young leaves, increasing the concentration of chlorophyll and carotenoids. This beneficial effect of low Cr concentrations was neither correlated to changes of Mn, P, or Fe tissue concentrations nor to Cr‐induced alterations of the Fe/Mn and P/Fe ratios. As total Fe was analyzed, the effect of Cr on the subcellular Fe distribution or on the Fe2+/Fe3+ratio can not be excluded.

ISSN:0190-4167    

DOI:10.1080/01904169109364211

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0190-4167    

DOI:10.1080/01904169109364212

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0190-4167    

DOI:10.1080/01904169109364205

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor