Differential susceptibility of two populations of Eucalyptus viminalis labill. to iron chlorosis

Abstract

I n comparing two populations of E. viminalis observations indicated that plants of a calcareous population (i) showed a greater yield at high pH, and when subjected to Fe-stress, (ii) took longer to develop chlorosis, (iii) more quickly developed new roots, and (iv) were capable of removing more Fe from solution than were plants of an acid population. Some Fe-stressed plants also appeared to be able to reduce Fe 3+ to Fe 2+, but population differences have not yet been clearly established. Plants from an acidic population accumulated very high levels of P in leaves when grown in alkaline solutions and, consequently, exhibited high P/Fe ratios, chlorosis, and symptoms of P toxicity.

The effect of high pH and P on the development of lime-chlorosis in two seedling populations ofEucalyptus obliqua L'Hérit

“…Population differences in P concentration observed in E. obliqua were similar to those of Ladiges 20,21, who found that plants from an acidic population of E.…”

Mechanisms of resistance to Phytophthora cinnamomi in clonal, micropropagated Eucalyptus marginata

“…Four-week-old seedlings and clonal plants were transferred to flexible plastic tubes ('WG7", Arthur Yates and Co., Cannington WA 6107) containing a 1:1 mixture of steam-sterilized acidwashed sand and vermiculite. Plants were supplied three times weekly with nutrient solution (Ladiges, 1977) supplemented with Osmocote fertilizer granules (Sierra Australia Pty Ltd, Castle Hill, NSW 2154) and were grown in a randomized design in a controlled-temperature glasshouse (25 ±5 C). At between 8 and 10 months plants were transferred to larger tubes ('WGIO', 50x63x230 mm long) after pruning the root system, to encourage new root formation, and lightly pruning the shoot.…”

Changes in Mineral Content ofEucalyptus marginataandE. calophyllaGrown under Controlled Conditions and Inoculated withPhytophthora cinnamomi

“…Seed of E. calophylla was surface sterilized with 0.1 % calcium hypochlorite and both species were grown in a sterile acid-washed sand and vermiculite mix (1 :2) in 15 cm pots. Plants were watered twice weekly using a nutrient solution slightly modified from that of LADIGES (1977) which had the following composition (values in mg H): N as NH4NO3, 30; P as NaH2PO4 • 2H2O, 5; K as K2SO4, 10; Ca as CaCl2, 50; Mg as MgSO4 • 7H2O, 20; B as H3BP3, 0.2; Zn as ZnSO4 • 7H2O, 0.1; Mn as MnSO4 • 4H2O, 0.1; Mo as (NH4) 6MoiO24 • 4H2O, 0.5; Cu as CUSO4 • 5H2O, 0.02; Fe as FeEDTA, 2.0; pH 6.2. Solution was applied as half strength for the duration of the experiment.…”