000			02572nam a2200193Ia 4500
003			MX-MdCICY
005			20250625124644.0
040			_cCICY
090			_aB-6534
245	1	0	_aSpatial and temporal variation in citrate and malate exudation and tissue concentration as affected by P stress in roots of white lupin
490	0		_vPlant and Soil , 241(2), p.209-221, 2002
520	3		_aExudation of carboxylates represents one the most efficient strategies used by P-starved white lupin (Lupinus albus L.)to acquire phosphorus from sparingly soluble sources. This exudation occurs through proteoid root clusters, with citrate being the predominant organic acid released. The occasional detection of malate in whole root exudates suggests that this acid would also be released, but from tissues other than root clusters. To investigate the spatial and temporal pattern of exudation, citrate and malate exudation and concentration were measured in whole roots and root sections of white lupin, from seedling emergence to plant senescence due to P starvation. Both organic acids were detected in whole root exudates of P-stressed plants, and they were released at similar rates throughout the experiment. Malate was predominantly exuded from apices of both seedling taproots and proteoid roots, whereas citrate exudation was restricted to proteoid root clusters. Studies directed to address the association between carboxylate exudation and concentration in proteoid root clusters showed a non-linear response for citrate, within the range of 7 to 23 mol g-1 fresh weight. This association was further assessed by altering citrate concentration in the whole root. Adding P to 24-day-old P-starved plants reduced citrate concentration and exudation to the level of the control P-fed plants, demonstrating that citrate exudation and concentration are associated. Malate exudation and concentration did not correlate significantly. Results indicate that citrate release by P-starved white lupin would occur whenever a certain threshold of citrate concentration is attained, and that the sites, the rates and the span of transient exudation depend on the physiological age of the tissue. Lupinus albus - organic acids - phosphorus deficiency - proteoid
700	1	2	_aPeñaloza, E.
700	1	2	_aCorcuera, L.J.
700	1	2	_aMartinez, J.
856	4	0	_uhttps://drive.google.com/file/d/1xV2jlpOVa1jTErH8uZsU3mNW2uBn40U2/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
942			_2Loc _cREF1
008			250602s9999 xx |||||s2 |||| ||und|d
999			_c40875 _d40875