Plants grow prior to photosynthesis by utilizing stored energy reserves in seeds
Plant seedlings depend on stored energy reserves such as starch, lipids, and proteins within seeds or cotyledons to fuel early growth and respiration before photosynthesis becomes fully established.
The retrieved papers consistently demonstrate that germinating seedlings rely on the mobilization and utilization of stored seed reserves (lipids, starch, proteins, and sucrose) to sustain early structural growth and respiration prior to or independent of active photosynthesis. Papers 0, 1, 4, and 5 all provide direct empirical support for this physiological process, while paper 2 discusses cotyledon photosynthesis after emergence. The evidence robustly supports the claim.
A. Elamrani, P. Raymond, P. Saglio. Nature and utilization of seed reserves during germination and heterotrophic growth of young sugar beet seedlings. 1992. https://doi.org/10.1017/s0960258500001045
Sugar beet seedlings rely on stored lipids and starch reserves for heterotrophic growth and development prior to photosynthetic autonomy.
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Christopher S. Brown, Steven C. Huber. Reserve mobilization and starch formation in soybean (<i>Glycine max</i>) cotyledons in relation to seedling growth. 1988. https://doi.org/10.1111/j.1399-3054.1988.tb09159.x
Soybean seedlings mobilize stored reserves, such as sucrose, to support early growth and metabolism during the first several days.
Maria Caus. The effect of negative temperature stress on the mobilization of seed reserves for germination and early seedling growth of different maize hybrids. 2024. https://doi.org/10.59295/sum6(176)2024_10
Maize seedlings utilize the mobilization of endosperm reserves to fuel early root and epicotyl growth during germination.
Walter E. Splittstoesser. Cotyledon Shading and Seedling Growth of Pumpkin1. 1981. https://doi.org/10.21273/hortsci.16.5.669
Pumpkin seedlings can sustain early axis tissue growth in the dark by utilizing stored cotyledon reserves.
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