Clanton C. Black

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Sucrose synthase (SS) was the dominant enzyme of sucrose metabolism in both stem and root vascular cambial zone tissues of nursery-grown loblolly pine (Pinrrs taeda L.) seedlings. Acid invertase (AI) and neutral invertase (NI) activities were generally less than 10% of the SS activity in both tissues. In both cambial tissues, seasonal patterns of enzyme(More)
Here it is reported that sucrose synthase can be readily measured in growing wild tomato fruits (Lycopersicon chmielewskii) when suitable methods are adopted during fruit extraction. The enzyme also was present in fruit pericarp tissues, in seeds, and in flowers. To check for novel characteristics, the wild tomato fruit sucrose synthase was purified, by(More)
Two and three years after the outplanting of 1-O northern red oak (Quercus rubra, NRO) and white oak (Q. ulba, WO) nursery stocks, the highest net photosynthetic rates (A-) were observed from seedlings growing on a clearcut site followed by those under a pine stand. Both NRO and WO seedlings under a hardwood stand had A, less than 10% of the full sun(More)
We studied root and stem sucrose metabolism in trees excavated from a 9-year-old artificially regenerated lob-1011~ pine (Pinus tueda L.) plantation. Sucrose synthase (SS) activities in stem and taproot vascular cambial tissues followed similar seasonal patterns until they peaked during September. After September, stem SS activity disappeared quickly,(More)
In leaves of plants with C(4) photosynthesis, sulfur assimilation is initiated in bundle sheath cells whereas carbon and nitrogen assimilation are initiated in mesophyll cells. The activation of sulfate by adenosine triphosphate sulfurylase in leaves of C(4) plants occurs in chloroplasts of bundle sheath cells and is effected by two isozymes of(More)
Loblolly pine (Pinus taedu L.) seedling height, root collar diameter (RCD) and the specific activities of three sucrose metabolizing enzymes, namely, sucrose spthase (SS), acid invertase, and neutral invertase, were measured to assess seedling responses to transplant stress. Bare-root nursery-grown loblolly pine seedlings were lifted and transplanted(More)
There is widespread agreement that the xanthophyll cycle provides a major photoprotection system for photosynthesis in green leaves (l-8). Indeed this type of photoprotection seems to be ubiquitous for photosynthetic organisms. Photoprotection is provided via a rapid, near 1013 set, ability of zeaxanthin (Z) to dissipate excess light energy from(More)
This account is dedicated to Dr. Guivi Sanadzc for his career long devotion to science and in recognition of his discovery of isoprene emission by trees during photosynthesis. Investigations on the emission of isoprene and other monoterpenes now have been extended globally to encompass other terrestrial vegetation, algae, waters, and marine life in the(More)
In mid-September when stems and roots of nursery-grown loblolly pine (Pinus taedu L.) seedlings are actively accumulating dry weight (DW), an extra 10, 20, or 40 kg NH,NO,.ha-' (lON, 20N, 40N) was applied. Seedlings receiving no extra N (ON) were the controls. The temporal patterns of seedling growth, nutrient concentrations, and sugar-metabolizing enzyme(More)