Mountain beech (Nothofagus solandri var. solandri) trunk diameters were measured in each of two catchments, a control, and a stream catchment (a putative lahar path), to assess the vulnerability of a hut sited on the Wakapapaiti Stream, Tongariro National Park, to disturbance events. Beech forest margins were more abrupt, terraced, and were adjacent to rocky areas in the stream catchment, while...

Watermelon [Citrullus lanatus (Thunb.) Matsum. and Nakai] plug seedlings were stored at 15°C in the light at a photosynthetic photon flux density of 15 µmol·m(-2)·s(-1) or in darkness for 6 days, to evaluate their chloroplast ultrastructure, and associated photosynthetic characteristics. Storage in the dark caused swelling, disordered granal arrangement, and starch grain disappearance in the ch...

“Morphologically improved” seedlings (large-diameter seedlings grown at low nursery spacings) have a higher probability of survival (about 5% better) than regular seedlings since they have larger root systems, a higher root-weight ratio (root dry weight/seedling dry weight), and have a greater root growth potential. In addition, these seedlings will grow faster during the first several years af...

glycine betaine (gb) is one of the osmotic plant-protecting members that accumulate in response to abiotic stresses. an experiment was, therefore, conducted to test whether gb application at various concentrations (0, 10, 20 and 30 mm) through seed soaking or foliar spray methods would protect cucumber seedlings, subjected to chilling stress. at two true leave stages, after gb treatment, the se...

Seedling regeneration after a high intensity wildfire was assessed in a mixed forest dominated by Eucalyptus species andCallitris endlicheri (Parl.) F.M.Bailey. Patternswere compared against the ‘slow seedling’or ‘tortoise-and-hare’ theory of competitive interactions betweengymnosperms andangiosperms.Browsing effectswere documentedusing fenced plots, and seedling density, mortality and height w...

a semi-automatic 9-row transplanter for bare root seedlings has recently been developed at the isfahan center for agricultural research that plants 80 seedlings/m2 using 9 operators at a capacity of 0.3 ha/d (8 h). separating a single seedling from a bunch and dropping it into a distributer cell by hand takes 1 s on average. at a density of 700-800 thousand/ha, the travel speed should not excee...

      Dust storms are increasingly threatening the forest ecosystem in Western Iran. Due to its coverage of vast area of Zagros forest, the Quercus brantii is at the front line of the attack. Most tree deaths in this forest are from this species. This study aims to investigate the effect of simulated dust on wood development and leaf stomata from seedlings of Persian oak. The oak seedlings were...

The effect of water deficit on carbohydrate status and enzymes of carbohydrate metabolism (alpha and beta amylases, sucrose phosphate synthase, sucrose synthase, acid and alkaline invertases) in wheat (Triticum aestivum L.) was investigated in the seedlings of drought-sensitive (PBW 343) and drought-tolerant (C 306) cultivars. The water deficit was induced by adding 6% mannitol (water potential...

Seedlings of Leptospermum scoparium J.R. et G. Forst (manuka) originating from seed from a low altitude coastal site (Auckland) and from a high altitude inland site (Desert Road) were grown for 96 days in four controlled environments to compare the relationship between growth temperature and frost hardening. Day/night temperature treatments were 12/6, 12/3, 12/0 and 12/-3 degrees C. Frost hardi...