Effect of seed source on growth and performance of potato (Solanum tuberosum L.) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cn69m7691

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  • Twenty Russet Burbank seed lots were collected from four states and one Canadian Province in 1988 and planted in replicated trails at Powell Butte and Hermiston, Oregon as part of a two year study to quantify clonal differences in the cultivar. Samples of each seed lot were concurrently increased and stored under identical conditions at Powell Butte to preclude physiological age differences in seed used for similar plantings in 1989. Non-genetic influences were further reduced in the second year (1989) planting by subjecting seed to a combination of eye-indexing and ELISA testing to eliminate virus infected tubers. It was postulated that any differences in yield and performance observed in 1989 would be primarily genetically related. Significant differences (p = 0.05) were noted in U.S. No. 1 yields at both locations and in total yields at Powell Butte in 1988. Similar plantings in 1989 using standardized seed from the 1988 Powell Butte increase showed significant differences in U.S. No. 1 yields only at Hermiston. However, differences significant at the p = 0.10 level were observed for both total and U.S. No. 1 yields, tuber size distribution, and tuber specific gravity during both years at Hermiston. The range in yields decreased with the use of standardized seed at Powell Butte as expected but increased at Hermiston. Reasons for these seemingly contradictory responses are unclear. If substantial differences in maturity existed among the seed lots/clones, the long growing season at Hermiston would have accentuated yield differences. The 1989 Hermiston season was 20 days longer than in 1988 and could have broadened yield ranges in 1989. It is possible that non-genetic factors such as physiological age and viral infection might have partially masked maturity effects at Hermiston in 1988. The Powell Butte growing season is too short to show strong yield benefits from delayed maturity. Consistent differences in seed lot performance in the absence of non-genetic influences such as seed tuber physiological age and viral content would suggest that useful clonal differences exist. Four seed lots in these studies consistently produced high yields at Powell Butte and three at Hermiston during both years while one produced high yields at both locations. Further, large yield differences were still evident at Hermiston in 1989 in trials planted with virus-tested, identically aged seed. These results suggest that line selection from these seed lots could produce high yielding Russet Burbank clones with good tuber conformation. Additional field trials are needed to fully characterize the nature and importance of these potential clonal differences.
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