Graduate Thesis Or Dissertation

 

Stomatal activity patterns in provenance plantations of Abies concolor and Abies grandis Public Deposited

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  • Seedlings from 25 provenances of Abies grandis and Abies concolor were studied at two plantations, 12 at Philomath, Oregon, and 13 at Camino, California. Native seedlings were studied at four of the provenances' field sites. Stomatal infiltration pressure measurements and plant moisture stress measurements were made throughout one summer on the plantation seedlings to identify their patterns of stomatal response to moisture stress. Stomatal distribution on the needle surface was used to determine the degree of resemblance of each provenance to the two Abies species. Seedlings from four provenances were also studied during December to determine which seedlings would retain the freshest Christmas tree characteristics after being cut, transported, stored and displayed, and whether 'heir response could be predicted from stomatal behavior. Three aspects of the stomatal response patterns differed from one provenance to another: (1) occurrence of daily stomatal closure or nonclosure, (2) time of closure and (3) degree of closure. The stomata of the Abies grandis provenances tended to close daily while the stomata of Abies concolor-influenced provenances remained open during the day. The Abies grandis stomata also tended to close earlier in the day than those in provenances mildly influenced by Abies concolor, which did close daily to some degree. The provenances represented at Camino could be grouped as to their degree of stomatal closure. The members of each group were generally morphologically similar, indicating genetic relationship. The stomatal response data suggest that some genetic control of stomatal response to moisture stress does exist. These genetically controlled responses conceivably could affect the establishment of seedlings of certain genotypes in particular habitats. The Christmas tree keepability experiment resulted in one provenance, 20, retaining its favorable characteristics relatively well, certainly better than the other provenances. Provenance 20 seedlings are, therefore, recommended to be used as Christmas trees due to their ability to retain fresh Christmas tree characteristics. Keepability was not predictable from the summer stomatal response, but was correlated with moisture stresses during display of the trees.
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