Seedling root development

Cuttings consisting of one or two leaves are usually rooted in plastic sleeves filled with an appropriate rooting medium. The sleeves are cared for in a nursery with the same precautions exercised as for seedlings. Callus development occurs in a few weeks, rooting begins in 6 to 8 weeks, and shoot growth is substantial in 4 to 5 months.21... 

Reinhardt DH, Rost TL. Salinity accelerates endodermal development and induces exodermis in cotton seedling roots. Env Exp Bot 1995 35 563-574. 

Studies on the white clover -Rhizobium trifolii interaction are the most advanced. Trifoliin A, a lectin present in clover-seedling roots, binds hapten reversibly to carbohydrate antigens cross-reactive on the capsular polysaccharide of R. trifolii and clover epidermal-cells.244 A specific hapten that inhibits binding of trifoliin A to both surfaces is 2-deoxy-D-arabino-hexose.245 It has also been shown that levels of trifoliin A on root hairs decline with increasing concentrations of nitrate, in parallel to root-nodule development,246 and that lectin receptors are transient on R. trifolii, in a way coinciding with its capacity to be adsorbed to clover roots.247... 

Davis, C. S., Ni, X. Z., Quisenberry, S. S. and Foster, J. E. 2000. Identification and quantification of hydroxamic acids in maize seedling root tissue and impact on western corn rootworm (Coleoptera Chrysomelidae) larval development. J. Econ. Entomol. 93, 989-992... 

Heinonsalo, J., Hurme, K. R. Sen, R. (2004). Recent C abelled assimilate allocation to Scots pine seedling root and mycorrhizosphere compartments developed on reconstructed podzol humus, E- and B-mineral horizons. Plant and Soil, 259, 111-21. 

Abundant water is necessary for good root development. It is especially important to give emerging seedlings an edge against weeds. Keep soil evenly moist, but not saturated. 

Seed Treatments. Several efforts to improve seed germination chemically have been made in recent years. The inhibition of lateral root development in cotton seedlings which can result from exposure to the... 

Gossypol and its methyl ethers (Fig. 1) also are formed in the epidermis and root hairs of the developing seedling root (9) and later are infused throughout the periderm of the root bark of older plants. Terpenoids also are exuded by roots, and exudation is increased by microbial infections (10, 11). Only the root tip is devoid of terpenoids, which may explain wRy this is the only area of the root penetrated by root-knot nematode or fungal wilt pathogens. 

Olsthoom, A.E.M., Keltjens, W.G., Van Baren, B., Hopman, M.C.G., 1991. Inflnence of ammonium on fine root development and rhizosphere pH of Douglas-fir seedlings in sand. Plant Soil 133, 75-81. 

The next two reactions in the pathway are catalyzed by aspartate semialdehyde dehydrogenase and homoserine dehydrogenase, respectively (Fig. 2). Both enzymes were initially detected in extracts of pea seedlings (Sasa-oka and Inagaki, 1960 Sasaoka, 1961) and subsequently characterized as B stereospecific with respect to hydride transfer from the dihydropyridine ring of NADPH (Davies el al., 1972). Aspartate semialdehyde dehydrogenase has also been detected in extracts of maize shoots, roots, developing kernels,... 

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