Carbon metabolism in scions of Colorado blue spruce. I. Needle starch
1988
Beeson, R.C. Jr | Proebsting, W.M.
Needle starch metabolism was studied during graft development of Colorado blue spruce (Picea pungens Englemann 'Hoopsi') scions on Norway spruce [Picea abies (L.) Karst] rootstocks. Starch accumulated during the initial stages of union formation, but the rate of accumulation slowed over time. Peak starch content in developing greenhouse grafts was approximately 30% and, in lath house grafts, approximately 50% of that in 3-year-old grafts forced in the greenhouse. Prior to budbreak, starch content declined rapidly, stabilizing at pre-grafting levels during shoot elongation. Grafts with misaligned unions accumulated starch during the first week, but the starch content then declined. Preventing photosynthesis in scions during unionformation prevented starch accumulation, but did not affect graft success or subsequent scion growth. We concluded that neither starch accumulation nor current photosynthesis in the scion were required during union development.
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