摘要:

Experiments were performed to test the effect of Ca2+and Mg2+upon ATPases (E.C. 3.6.1.3) from barley roots (Hordeum distichon L.cv.MULTUM) that had or had not taken up Al3+. Furthermore, the effect of the uptake period was examined. With longer duration of the Al3+uptake, the activity of the ATPases dropped, independently of whether they were activated by Ca2+or by Mg2+. Mg2+stimulated the activity of the ATPases if no Al3+had been taken up with lacking Ca2+in the assay. If Al3+had been taken up no additional activation by Mg2+to the Ca2+stimulation could be observed, and in some cases Mg2+decreased the Ca2+stimulation.

ISSN:0190-4167    

DOI:10.1080/01904168309363096

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An experiment was conducted to clarify the relationship between Mn toxicity and Fe deficiency in bush snap bean (Phaseolus vulgarisL. cv. ‘Wonder Crop No. 2'). Seedlings were grown in full strength Hoagland No. 2 solution at pH 6.0 for ten days. Six concentrations of Mn as MnCl2.4H2O were used in combination with three concentrations of Fe as FeEDTA.

ISSN:0190-4167    

DOI:10.1080/01904168309363097

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Boron deficiency symptoms in snap beans (Phaseolus vulgarisL.) showed as general yellowing of tops with slow flowering and pod formation, while toxicity caused reduced growth and burned dark brown older leaves especially on the edges. In radish (Raphanus sativusL.)fB deficiency resulted in roots which were brown upon cutting and had thick periderm. Even at 4 ppm applied B, no visible B toxicity was noted in radish. The plant tissue B levels of less than 9 to 12 ppm were associated with B deficiency in radish and beans; and greater than 125 ppm with B toxicity in beans. In tomatoes (Lycopersicon esculentum, Mill) B deficiency resulted in reduced growth while B toxicity at 4 ppm applied B caused poor and slow germination. Boron deficiency and toxlcity in tomatoes were related to < 12 and > 172 ppm B, respectively, in tissue. No B deficiency was noted in corn (Zea maysL.) and timothy (Phleum pratenseL.). The B toxicity in these two crops appeared as marginal burning and dark brown tips of older leaves and was related to greater than 98 and 176 ppm tissue B in corn and timothy, respectively.

ISSN:0190-4167    

DOI:10.1080/01904168309363098

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Bush beans,Phaseolus vulgarisL. cv. Improved Tendergreen, were grown for 18 days in 3700 ml. nutrient solutions in a factorial experiment involving 3 levels of K (10‐2, 10‐3, 10‐4N) and 3 levels of Cs (10‐4, 5 x 10‐5, 10‐5N). Mild K deficiency was observed for the low K level but no yield differences were due to Cs. Increasing K markedly decreased the Cs concentrations in all plant parts. The relative uptake of K vs Cs was not influenced by Cs but was by K. The concentration ratio (C.R.) for K in trifoliate leaves varied from 99 (high K) to 7315 (low K). The C.R, for Cs in trifoliate leaves varied from 8,67 (high K) to,0.96 (low K). Potassium was translocated to trifoliate leaves from 89 to 843 times that of Cs. The “Y”; values for Cs in plant parts was consistently near 1 meaning that Cs uptake was directly proportional to its concentration in the nutrient solution. The “Y”; values for K in plant parts were around 0.5 for 10‐3/10‐4N K but only about 0,2 for 10‐2/10‐3N K. Roots accumulated about 6 times more Cs than did leaves while K was quite uniformly distributed among plant parts. The uptake relationship for K and Cs then was vastly different indicating that K would not likely be a good carrier of radiocesium in food chains.

ISSN:0190-4167    

DOI:10.1080/01904168309363099

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In a field experiment, the influence of several rootstocks of citrus, viz., Srinagar mandarin (C.reticultaBlanco), Malta common (C. sinensisOsbeck), Jambhiri (C. lambhiriLush), Kagzi kalan (C. aurantifoliaSwingle), Rangpur lime (C. limoniaOsbeck), Carrizo citrange (bigeneric hybrid), Baduvapuli (C. pennivesiculataTanaka), Cleopatra (C. reticulataBlanco), Troyer citrange (bigeneric hybrid) and Hill lemon (C. limonBarm f.) on mineral composition of Srinagar mandarin (C. reticulataBlanco) leaves was studied. The results showed a wide and varying influence of rootstocks on mineral composition in scion leaves due to their differential ability to absorb nutrients and to translocate to scion leaves. Malta and mandarin rootstocks were generally associated with less N, Ca and Mg concentrations in scion leaves than rough lemon and citranges rootstocks. Rangpur lime followed by other mandarins resulted in relatively low P concentration whereas malta and citranges caused high P concentration as compared to other stocks. Considering the influence on K concentration, plants on malta rootstocks exhibited high level whereas it was low in plants grown on citranges.

ISSN:0190-4167    

DOI:10.1080/01904168309363100

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The aspartic acid,tyrosine and serine contents of leaves were found reduced in prematurely reddened leaves of hirsutum cotton (Gossypium hirsutum) as compared to healthy green leaves. Amino acids other than those listed above were higher in the affected red leaves. Amino acids threonine and proline increased 63.7 and 2.3 fold over green leaves respectively. Chemical sprays not only maintained the levels of various amino acids at par with green leaf but tended to increase the concentration above the levels obtained in normally found green leaf. However, threonine level was dropped in treated leaves as compared to partly affected red leaf and chemical sprays significantly reduced the leaf reddening when it was sprayed before flowering. It can be suggested that the leaf reddening can possibly be arrested by monitoring threonine content in leaves of hirsutum cotton ov. L‐147.

ISSN:0190-4167    

DOI:10.1080/01904168309363101

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0190-4167    

DOI:10.1080/01904168309363095

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor