ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00602.x

年代:1969

数据来源: WILEY

摘要:

SUMMARYSuccinate dehydrogenase activity, NAD‐linked malate, isocitrate and alcohol dehydrogenase activity and NADH:nitro‐blue tetrazolium reductase activity were demonstrated in sections of fresh or frozen pea cotyledons, using nitro‐blue tetrazolium as indicator. The localization of the various enzymes shows much resemblance. Initially, high enzyme activity is present in the cells of the epidermis and hypodermis. This activity decreases during germination. In the storage parenchyma, the enzyme activity in almost all cells increases during the first three days of the germination, and decreases subsequently, especially in the cells of the outer abaxial zone. The tracheary elements do not show any dehydrogenase activity. They appear during germination. The activity of the other cells of the vascular system increases during the first three days of germination but hardly changes in the subsequent seven

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00603.x

年代:1969

数据来源: WILEY

摘要:

SUMMARYNet photosynthesis was measured in plants of four coffee varieties (two ofCoffea arabicaand two ofCoffea canephora(robusta)) at several temperature and light conditions.It was observed that light saturation occurred at approximately 0.11 cal cm–2min–1, whereas net photosynthesis decreased with increasing temperatures above 20 °C (approximately 7% per °C). Thearabicaselection S288–23 showed the highest net photosynthesis and the lowest percentual decrease with excessive temperatures. The results are in good agreement with field experiments of plants of the same groups.The method used, may be applied for a comparison of potential dry matter production between varieties under different environmental con

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00604.x

年代:1969

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00605.x

年代:1969

数据来源: WILEY

摘要:

SUMMARYIndoleacetic acid oxidase can be present in extracts of pea roots either as a high molecular form or as a lower molecular one or both. The smaller units can separate from the high molecular unit by certain treatments of the enzyme preparation.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00606.x

年代:1969

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00607.x

年代:1969

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00608.x

年代:1969

数据来源: WILEY

摘要:

SUMMARYTransport and metabolism of auxin have been studied in explants ofColeus.An ageing period preceding a transport experiment causes a decrease in the amounts of radioactivity transported.A pre‐treatment with auxin during the ageing period maintains the transport on the original level.The formation of various auxin metabolites is affected by the ageing proces

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00609.x

年代:1969

数据来源: WILEY

摘要:

SUMMARYThe foliar uptake of134Cs in the primary leaves of beans has been studied under conditions of varying temperature, humidity and air flow on the leaf surface. Enhanced penetration was obtained by increasing air humidity or leaf moisture content through a decrease in transpiration. Accumulation and transport followed the same pattern and were influenced more by temperature than by humidity.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00610.x

年代:1969

数据来源: WILEY

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1969.tb00611.x

年代:1969

数据来源: WILEY