Root development, effect

Among them fractions IPAl, IPA2, 1PA3, IPA4 contained mostly galacturonic acid (Table 2) and apparently consisted of oligogalacturonides. These fractions inhibited root development in BTCL explants, the same effect of such fragments has been observed in tobacco TCL explants [16]. 

Potential team leaders learn how to determine the appropriate investigation methodology, how to gather data, how to analyze data for causal factors, how to determine root causes of causal factors, and how to develop effective recommendations and reports. 

To date, most experimental work demonstrating effects of BS on root development has involved exogenous presentation of the test steroids to the root (or rooting) medium. Without doubt, this bears no resemblance to the in vivo situation where roots would respond (if at all) to endogenous BS either synthesized within the root or transported from the shoot. As a first step towards assessing the... 

The texture and structure of a soil also affect plant response to nitrogen additions through effects on root development and depth of penetration. A restricted root system limits the ability of the plant to assimilate nutrients and also limits its uptake of water. Since the movement of water through soils by capillarity is slow and limited, the plant roots must literally go after it. A deep root system, therefore, assures that a much greater proportion of the supply in the soil is available to the plant. In addition, soil compaction limits the absorption of the rainfall. Such unfavorable conditions do of course lower the efficiency of applied nitrogen. 

Peat in mixture with soil, and adequately supplied with nutrients, serves as an excellent medium for root growth if it is not too acid. In very compact soils growth is often curtailed because of the inability of roots to penetrate them readily. Peat corrects this and in addition releases nutrients that favor root development. Root penetration into the subsoil is often curtailed because of either the presence of a hardpan, lack of calcium, or too much soluble aluminum. The addition of peat is not likely to correct these conditions unless it is mixed with the subsoil. Where this can be done, a comparatively small amount of peat, reinforced with the needed nutrients, may have a long-term effect in correcting the unfavorable condition. 

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