WebbThe loading and unloading of food (phloem sap) to and from the sieve tube cells is Active and passive respectively (2) Passive and passive respectively HX (3) Passive and active … Webb23 dec. 2014 · Passive symplastic loading • Tran locate sucrose and have ordinary companion cells • Possess abundant connections b/w the sieve element-companion cell complex and surrounding cells. • Species with passive symplastic loading are characterized by high overall sugar concentrations in the source leaves, which maintain …
What Is Phloem Unloading? Plant Physiology Oxford Academic
Webb20 mars 2024 · We conclude that passive loading is sufficient to drive long-distance transport in large plants, and that trees are well suited to take full advantage of passive … WebbLong-distance transport in the phloem takes place in living cells, the sieve tubes (Fig. 3.9).The principles of the phloem transport mechanism were proposed as early as 1930 by Münch in a pressure flow hypothesis based on the principle of an osmometer (Chapter 5; White, 2024).Münch suggested that solutes such as sucrose are concentrated in the … diamond star dental cathedral city
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Webb9 jan. 2024 · The plant-parasitic plant interaction is a interesting model to study sink-source relationship and phloem unloading. The parasitic plants, such as the achlorophyllous plant Phelipanche ramosa, connect to the host phloem through the haustorium and act as supernumerary sinks for the host-derived photoassimilates, … Webb20 mars 2024 · Phloem mechanical pressure. Passive phloem loading has, until recently, been thought insufficient to drive transport over long distances, because the passive … WebbWhy phloem unloading is an active process? Organic solutes such as sucrose are transported from the source to sink through phloem tissues. Transport by phloem is … diamond star corp clear vases