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Accueil du site → Doctorat → Canada → Role of arbuscular mycorrhizal fungus, Glomus intraradices (Schenck and Smith) colonization in drought tolerance of maize, Zea mays

University of Ottawa (1998)

Role of arbuscular mycorrhizal fungus, Glomus intraradices (Schenck and Smith) colonization in drought tolerance of maize, Zea mays

Subramanian, Kizhaeral S.,

Titre : Role of arbuscular mycorrhizal fungus, Glomus intraradices (Schenck and Smith) colonization in drought tolerance of maize, Zea mays

Auteur : Subramanian, Kizhaeral S

Université de soutenance : University of Ottawa

Grade : Doctor of Philosophy (Ph.D.) 1998.

Résumé
The purpose of this thesis was to study the potential factors involved in mycorrhizae-assisted drought tolerance in maize (Zea mays L.). We hypothesized that the AM colonization promotes drought tolerance of the host plant. This may be as a consequence of altered water relations. metabolism or nutritional statu of the host plant. These changes enable the host plant to sustain water deficit conditions and recover more rapidly when irrigation is restored. To test thwe hypotheses, the five objectives were : (i) To measure the physiological responses in rnaize plants in the absence or presence of AM colonization ; (ii) To examine the metabolic changes in these plants ; (iii) To determine the host plant nutritional status in order to assess the ability of AM plants to support kernel development ; (iv) To evaiuate the drought recovery of maize and (v) To examine the effects of AM colonization on nitrogen assimilation in maize as a potential factor in drought toierance. In order to accomplish these objectives, two greenhouse experirnents were conducted with the sarne set of treamients at two criticai stages in maize, the preflowering and tasselling stages. Freshly regenerated seeds of selection cycles CO (cv. drought-sensitive) and C8 (cv. drought-res istant) of the lowland tropical population ’Tuxpefio sequia’ were used for this study. Maize plants were subjected to drought stress for 3 wks at preflowering (45-66 days after sowing) or tasselling stages (75-95 DAS) thereafter the plants were rewatered until the end of the experiment. One half of the maize plants were inoculated with AM fungus (Glomus infraradces Schenck & Smith) at the time of sowing.

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