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090			_aB-17049
245	1	0	_aInfluence of soil O2 and CO2 on root respiration for Agave deserti
490	0		_vPhysiologia Plantarum, 76(2), p.187-192, 1989
520	3		_aRespiration measured as CO2 efflux was determined at various soil O2 and CO2concentrations for individual, attached roots of a succulent perennial from the Sonoran Desert, Agave deserti Engelm. The respiration rate increased with increasing O2concentration up to about 16 percent O2 for established roots and 5 percent O2 for rain roots (fine branch roots on established roots induced by wetting of the soil)and then remained fairly constant up to 21 percent O2. When O2 was decreased from 21 to 0 percent, the respiration rates were similar to those obtained with increasing O2 concentration. The CO2concentration in the root zone, which for the shallow?rooted A. deserti in the field was about 1 000 ?l l?1, did not affect root respiration at concentrations up to 2 000 ?l l?1, but higher concentrations reduced it, respiration being abolished at 20 000 ?l l?1 (2 percent)CO2 for both established and rain roots. Upon lowering CO2 to 1 000 ?l l?1 after exposure to concentrations up to 10000 ?l l?1 CO2, inhibition of respiration was reversible. Uptake of the vital stain neutral red by root cortical cells was reduced to zero, indicating cell death, in about 4 h at 2 percent CO2, substantiating the detrimental effects of high soil CO2concentrations on roots of A. deserti. This CO2 response may explain why roots of desert succulents tend to occur in porous, well?aerated soils.
650	1	4	_aAGAVE DESERTI
650	1	4	_aGAS EXCHANGE
650	1	4	_aRESPIRATION
650	1	4	_aROOT
650	1	4	_aSOIL
700	1	2	_aPalta, J. A.
700	1	2	_aNobel, P. S.
856	4	0	_uhttps://drive.google.com/file/d/1q__vv-En8LRxQaWYR0dXxJywkXqelRNm/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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