Responses of Bean Plants to Root Temperatures

Abstract

The foliar uptake and subsequent transport in bean plants of 22Na, 32pand 134CS was studied under controlled environmental conditions but at varying root temperatures. The amounts taken up by the plants, held in the treated areas, distributed in various plant fractions or excreted through the roots were determined for periods of up to 6 days. Uptake of 22Na was found to be slower than that of mcs and much faster than that of 32P. Root temperature strongly influenced the rate of entrance of the isotopes with an optimum range between 20 and 25°C. The penetration was found to be more affected by the root temperature during the pretreatment period than by that during the experimental period itself. The translocation and distribution during the first 6 hours of the experimental periods were also influenced by the pretreatment temperature of the roots. Na and Cs leakage in the solution was found to occur at all temperatures, provided transport had allowed their presence in the root tissues.

Root Temperature and Percentage NO3−/NH4+ Effect on Tomato Plant Development I. Morphology and Growth1

“…Root temperature was found to have an effect on both root and leaf morphology and anatomy (2,10,20); and on many of the plant functions, such as photosynthesis (8), respiration (II), water absorption ( 16), water movement and transpiration (15), as well as ion uptake (20). Cooper (5) found that N content in tomato increases with increasing temperature.…”

Growth of Corn Seedlings: Effects of Night Temperature Under Optimum Soil Moisture or Under Drought Conditions

“…developrnent, and yield of corn temperature has been published. The efl'ects are greatly influenced by tempcrilturc of night temperatures may be irnportant to (Brouwer et al 1973). Warmer temperatures crop adaptation since the distribution of C4 hasten development (Hunter et al 1974) and grasses in Nofih America is correlated with warmer daytime temperatures generally minimum temperatures (Teeri and Stowe promote growth (Duncan and Hesketh 1968;1976 (Kirkham and Ahring 1978).…”

Vertical gradient in soil temperature stimulates development and increases biomass accumulation in barley

“…Beauchamp & Lathwell 1967). The elongation of individual roots (Ching & Barber 1979;Abbas Al-Ani & Hay 1983;Stone & Taylor 1983) and root branching (Brouwer & Hoogland 1964;Stone & Taylor 1983;Kaspar & Bland 1992;McMichael & Quisenberry 1993) are positively correlated with increasing root temperature until the temperature optimum is reached. In addition, higher root temperatures cause an increase in stomatal conductance and photosynthesis (Starr, Neuman & Oberbauer 2004) and affect the water status of plants (Dodd et al 2000;Boucher et al 2001).…”