Some Factors Affecting Absorption and Translocation of Zinc in Citrus Plants.

Abstract

PLANT PHYSIOLOGY bility is small and the response to red radiant energy is very reproducible. The material is easy to handle and manipulate. The assay is reliable between 103MAw/cm2 and 10 uw/cm2 of red (625 to 700 m,u) and the photoresponse is directly proportional to the logarithm of the irradiance.The technic consists of excision of the hook from 6-day-old seedlings of Black Valentine bean and exposure to red energy (625 to 700 m,u). The angle of hook opening is a quantitative measure of the photomorphogenic effect. The presence of bud, leaves or cotyledons, particularly the latter, causes an effect opposing the photoreaction, as does also 3-indoleacetic acid.The photoresponse increases with age of the seedling up to seven days, but at this age the hook has progressed up the stem close to the cotyledonary node; therefore, 6-day-old seedlings were found most suitable. In complete darkness no opening could be observed for 16 to 24 hours following excision; with red energy, the lag period was 4 hours and the subsequent opening was at a markedly increased rate as compared to the dark. The maximum opening in the red occurred at 250 C; in the dark at 300 C.

Wastewater Reuse for Alfalfa Production in the Gaza Strip

“…As indicated in Table 9, most of the tested parameters in oranges and lemons were below the instrumental detection limit. It is documented in several publications that Zn is elevated and linked to the presence of vitamin C and can stimulate the growth of citrus (Brusca and Haas 1959;Leonard et al 1958;Ogunlesi et al 2009;Stewart et al 1955;Wallihan and Heymann-Herschberg 1956). The findings of the current study are consistent with this phenomenon.…”

Distribution and Transport of Foliar Applied Zinc in Pistachio

“…TRANSLOCATION AND DISTRIBUTION OF FOLIAR ABSORBED ZINC IN PISTACHIO SEEDLINGS. Since previous reports on the transport of foliar-applied Zn were contradictory (Bukovac and Wittwer, 1957;Wadsworth, 1970;Wallinhan and Heymann-Herschberg, 1956), experiments were designed to test if the inconsistency is partly due to the effect of plant or leaf age.…”

FOLIAR ABSORPTION OF MINERAL NUTRIENTS WITH SPECIAL REFERENCE TO THE USE OF RADIOISOTOPES AND THE "LEAF WASHING TECHNIQUE" (thesis)

“…-Herschberg in 1956(59) washed the treated leaf with an acidified detergent solution to remove the residue from one drop of 65 radio-aim (Zn ' ) applled to either side of a n orange leaf. Absorption of Zn 6 5 was calculated from the counts detected on either side of surfaces of the 1 leaf after washing.…”

“…guage stainless steel needle. The drop was applied to the upper surface on the main vein, midway from the apex to the base, since it had been p r eviously determined that absorption was greatest from this region of the leaf(34,48,59). Special c a r e was exercised not to induce leaf injury with the tuberculin s,yringe needle, since Volk and McAuliffe(57) reported that ten times m o r e absorption occurred with urea nitrogen on tobacco leaves following sligh't injury from a camel's hair brush.…”