326.- North, G.B., and Nobel, P.S. (2000) Heterogeneity in water availability alters cellular development and hydraulic conductivity along roots of a desert succulent. Ann. Bot. 85: 247-255.

327.- Nobel, P.S, and De la Barrera, E. (2000) Carbon and water balances for young fruits of platyopuntias. Physiol. Plant. 109: 160-166.

328.- Nobel, P.S. (2000) Crop ecosystem responses to climatic change: Crassulacean Acid Metabolism crops. In: K.R. Reddy and H.F. Hodges, eds. Climate Change and Global Crop Productivity. CAB International, N.Y. Pp. 315-331.

329.- Pimienta-Barrios, Eu., Zañudo, J., Yepez, E., Pimienta-Barrios, En., and Nobel, P.S. (2000) Seasonal variations of net CO2 uptake for cactus pear (Opuntia ficus-indica) and pitayo (Stenocereus queretaroensis) in a semi-arid environment. J. Arid Environ. 44: 73-83.

330.- Drennan, P.M., and Nobel, P.S. (2000) Responses of CAM species to increasing atmospheric CO2 concentrations. Plant Cell Environ. 23: 767-781.

331.- Nerd, A., and Nobel, P.S. (2000) Water relations during ripening for fruit of well-watered versus water-stressed Opuntia ficus-indica. J. Amer. Soc. Hort. Sci. 125: 653-657.

332.- Bobich, E.G., and Nobel, P.S. (2001) Biomechanics and anatomy of cladode junctions for two Opuntia (Cactaceae) species and their hybrid. Am. J. Bot. 88: 391-400.

333.- Bobich, E.G., and Nobel, P.S. (2001) Vegetative reproduction as related to biomechanics, morphology and anatomy of four cholla cactus species in the Sonoran Desert. Ann. Bot. 87: 485-493.

334.- Martre, P., North, G.B. and Nobel, P.S. (2001) Hydraulic conductance and mercury-sensitive water transport for roots of Opuntia acanthocarpa in relation to soil drying and rewetting. Plant Physiol. 126: 352-362.

335.- Linton, M.J., and Nobel, P.S. (2001) Hydraulic conductance, hylem cavitation and water potential for succulent leaves of Agave deserti and A. tequilana. Int. J. Plant Sci. 162: 747-754.

336.- Pimienta-Barrios, E., Robles-Murguia, C., and Nobel, P.S. (2001) Net CO2 uptake for Agave tequilana in a warm and a temperate environment. Biotropica 33: 312-318.

337.- Pimienta-Barrios, E., González del Castillo-Aranda, M.E., and Nobel, P.S. (2002) Ecophysiology of a wild platyopuntia exposed to prolonged drought Environ. Exp. Bot. 47:77-86.

338.- Nobel, P.S., and Bobich, E.G. (2002) Plant frequency, stem and root characteristics, and CO2 uptake for Opuntia acanthocarpa: elevational correlates in the northwestern Sonoran Desert. Oecologia 130: 165-172.

339.- Nobel, P.S. (2001) Ecophysiology of roots of desert plants, with special reference to agaves and cacti. In: Y. Waisel, A. Eshel, and U. Kafkafi, eds. Plant Roots: The Hidden Half, 3rd Ed. Marcel Dekker, New York. In press.

340.- Nobel, P.S. (2001) Physiological ecology of columnar cacti. In: T.H. Fleming and A. Valiente-Banuet, eds. Evolution, Ecology and Conservation of Columnar Cacti and Their Mutualists, University of Arizona Press, Tucson, Atizona. In press.

341.- Nobel, P.S. and Bobich, E.G. (2002) Environmental biology. In: P.S. Nobel, ed. Cacti: Biology and Uses, University of California Press, Berkeley, California. In press.

342.- Nobel, P.S., Pimienta-Barrios, E., Zañudo Hernández, J., and Ramírez-Hernández B. (2002) Historical aspects and net CO2 uptake for cultivated Crassulacean acid metabolism plants in Mexico Ann. Appl. Biol. 140: 133-142.

343.- Pimienta-Barrios, Eu., Pimienta-Barrios, En., Salas-Galván, M.E., Zañudo-Hernández J., and Nobel, P.S. (2002) Growth and reproductive characteristics of the columnar cactus Stenocereus queretaroensis and their relationships with environmental factors and colonization by arbuscular mycorrhizae Tree Physiol. 22:667-374.

344.- Nobel, P.S. and De la Barrera, E. (2002) High temperatures and net CO2 uptake, growth, and stem damage for the hemiepiphytic cactus Hylocereus undatus Biotropica 32:225-231.

345.- Bobich, E.G., and Nobel, P.S. (2002) Cladode junction regions and their biomechanics for arborescent platyopuntias Int. J. Plant Sci. 163: 507-517.

346.- Nobel, P.S. and De la Barrera, E. (2002) Stem water relations and net CO2 uptake for a hemiepiphytic cactus during short-term drought Environ. Exp. Bot. 48:129-137.

347.- Nobel, P.S. and Bobich, E.G. (2002) Initial net CO2 uptake responses and root growth for a CAM community placed in a closed environment Ann. Bot. 90:593-598.

348.- Martre, P., North, G.B., Bobich, E.G., and Nobel, P.S. (2002) Root deployment and shoot growth for two desert species in response to soil rockiness Amer. J. Bot. 89:1933-1939.

349.- Nobel, P.S. and De la Barrera, E. (2002) Nitrogen relations for net CO2 uptake by the cultivated hemiepiphytic cactus, Hylocereus undatus Sci. Hort. 96:281-292.

350.- Martre, P., Morillon, Raphael, Barrieu, F., North, G.B., Nobel, P.S., and Chrispeels, M. (2002) Plasma membrane aquaporins play a significant role during recovery from water deficit Plant Physiol. 130:2101-2110.

351.- Nobel, P.S., De la Barrera, E., Beilman, D.W., Doherty, J.H., and Zutta, B.R. (2002) Temperature limitations for cultivation of edible cacti in California. Madroño 49:228-236.

352.- De la Barrera, E. and Nobel, P.S. (2003) Physiological ecology of seed germination for the columnar cactus Stenocereus queretaroensis J. Arid Environ. 53: 297-306.

353.- Nobel, P.S. and De la Barrera, E. (2003) Tolerances and acclimation to low and high temperatures for cladodes, fruits, and roots of a widely cultivated cactus, Opuntia ficus-indica New Phytol. 157:271-279.