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inoculated snapdragon, the AUDPC in trial 1 was 105.4 and 112.2 for trial 2. There were significant differences between the two trials, but the results revealed a similar trend of effectiveness among the plant protectants. Data are presented for trial 2 only

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chemical priming with physiological stress protectants. Stress protectants such as salicylic acid (SA), ascorbic acid (AsA), and calcium (Ca) that are naturally found in the plant can regulate various physiological and biochemical processes. Furthermore

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et al., 2001 ). An alternative to sprinkler irrigation for plant establishment is the application of crop protectants after transplant ( Santos et al., 2012b ). Crop protectants provide a shield that reduces environmental stress on plants. During

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Research and Extension Center in Mills River, NC, USA (lat. 35.428079°N, long. 82.563295°W, elevation 649 m), were conducted in 2017 and 2018. Trees were planted in 1992 with spacing of 2.7 × 6.1 m, trained to a central leader, and received plant protectant

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ultraviolet, to provide broad-spectrum protection ( Moloney et al., 2002 ). In a similar fashion, RAYNOX® provides a unique technology for sunburn reduction in fruits, because it is the only commercial sunburn protectant for plants that contains organic

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Abstract

Polyamines acted as antisenescence agents (2, 5), increased membrane stability of beet root, rose petal, and spinach leaf tissue (8, 9), and decreased the rate of chlorophyll degradation in radish cotyledons (2). Ozone is a major air pollutant causing economic losses to crops in agricultural areas (1). One approach to controlling the damage caused by ozone has been the use of chemical protectants (7), but consistent responses have been difficult to achieve. The antisenescence properties of polyamines may confer protectant properties that will reduce or prevent ozone-induced injury to plants. Previous studies have shown increased membrane permeability by ozone at 0.15 μl·liter−1 (4) and increased senescence with ozone at 0.15 μl·liter−1 (3). The objective of this study was to determine if the polyamines—spermine, spermidine, and putrescine—could act as protectants in tomato (Lycopersicon esculentum Mill.).

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To root tissue-cultured apple cultivars, shoots from proliferating cultures were first transferred to root induction medium with IBA for 1 week in the dark. Shoots were later transferred to the same medium without IBA and incubated under light for elongation of the roots. Rooted shoots were then transferred to Jiffy-7s supplemented with biological plant protectant and fertilizer, and incubated in plastic humidity trays. After 2 to 3 weeks, plants were transferred to pots and covered with plastic bags to facilitate acclimation. This technique has resulted in 70% to 100% of shoots selected in vitro producing vigorously growing, healthy plants in the greenhouse. Chemical name used: indolebutyric acid (IBA).

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Abstract

Seeds of ‘Florida-Sweet’, a high-quality, fresh market, sh2 sweet corn (Zea mays L.), tend to have low germination and the seedlings are also more susceptible to root rot than standard sweet corn (su). Difolatan plus benomyl as seed protectants controlled the soil fungus complex and significantly improved yields without reducing ear quality. Compensated-rate seeding, or seeding adjusted according to germination percentage to give 54,000 plants/ha with seeds of 70% to 100% germination, produced no yield or quality reduction in most cases. However, regression analysis showed in 1 out of 3 tests a significant linear decrease between seed germination percentages and yields of U.S. Fancy ears.

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Interactive effects of different temperature regimes and anti-transpiration organic materials, Surround WP (kaolinite clay) and Raynox (sun-protectant), on two strawberry (Fragaria ×ananassa) cvs. Chandler and Sweet Charlie were investigated under controlled environmental conditions. Newly planted strawberries treated with Surround and Raynox were subjected to 20/15, 30/25, and 40/35 °C (day/night) temperature regimes and 16 day/8 night photoperiod in growth chambers for 42 d. Photosynthesis (A) and photochemical efficiency (Fv/Fm) were measured at 7-d intervals during the experiment. Plants treated with Raynox displayed greater resistance to high temperature (40/35 °C) compared to those treated with Surround. Net photosynthesis of both cultivars decreased significantly with time at 40/35 °C. There was no significant difference in photosynthetic rate between the two cultivars. Nevertheless, there was difference in plant biomass between the cultivars. Raynox provided more protection against high temperature, specifically in reducing stomatal conductance and limiting transpiration, than Surround.

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142 WORKSHOP 19 (Abstr. 688-690) Opportunities and Challenges in the Development and Registration of Plant Growth Regulators Wednesday, 26 July, 10:00 a.m.-12:00 noon

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