Plant physiology - Chapter 23 Abscisic Acid: A Seed Maturation and Antistress Signal ppt

... mutants aba3: Arabidopsis mutant nar 2a: Barley mutant Abscisic acid (C 15 ) (ABA) ABA- - D-glucose ester Phaseic acid (PA) 4‘-Dihydrophaseic acid (DPA) Conju- gation ABA inactivation by conjugation with ... hydraulic conductivity of the root and Abscisic Acid: A Seed Maturation and Antistress Signal 555 increases the root:shoot ratio at low water potentials. ABA and...

Ngày tải lên: 16/03/2014, 22:20

... elon- gation, and stomatal movements. The stomatal responses to blue light are discussed in detail because of the impor- tance of stomata in leaf gas exchange (see Chapter 9) and in plant acclimations ... the low irradiances prevailing early and late in the day. (B) Stomatal apertures in the same leaves used to measure guard cell zeaxanthin content. (After Srivastava and Zeiger 19...

Ngày tải lên: 16/03/2014, 22:20

... 11 CAG AAA AGG tRNA rRNA mRNA mRNA tRNA tRNA mRNA Translation Transcription Processing Cap Cap Cap Poly -A Poly -A Poly -A Poly -A Cap Poly -A Cap Cap Poly -A Poly -A DNA RNA transcript RNA Nucleus Nuclear pore Nuclear envelope Cytoplasm ExonIntron Ribsomal subunits Amino acids Signal ... nomenclature for plant A- , B- and D-type cyclins based on sequence organization. Plant...

Ngày tải lên: 20/02/2014, 01:20

... by the addition of the suffix “-ase”—for example, α-amy- lase, malate dehydrogenase, β-glucosidase, phospho- enolpyruvate carboxylase, horseradish peroxidase. Many thousands of enzymes have already ... biotin carries CO 2 , and tetrahydrofolate carries one-carbon fragments. Peroxidase has both heme and Ca 2+ pros- thetic groups and is glycosylated; that is, it contains car- bohydrates c...

Ngày tải lên: 20/02/2014, 01:20

... Corn yield as a function of water availability. The data plotted here were gathered at an Iowa farm over a 4-year period. Water availability was assessed as the num- ber of days without water stress ... IN PLANT LIFE Water makes up most of the mass of plant cells, as we can readily appre- ciate if we look at microscopic sections of mature plant cells: Each cell contains a large wa...

Ngày tải lên: 20/02/2014, 01:20

... Leaf Transpiration and Water Vapor Gradients An analysis of leaf transpiration and stomatal conductance ,and their relationship with leaf and air water vapor concentrations. Web Essays 4.1 A Brief ... plants Y p = −2T r Water Balance of Plants 49 AirRoot hair Root Water Sand particle Clay particle FIGURE 4.2 Root hairs make intimate contact with soil particles and greatly amplify...

Ngày tải lên: 20/02/2014, 01:20

... particles, both inorganic and organic, have predomi- nantly negative charges on their surfaces. Many inorganic soil particles are crystal lattices that are tetrahedral arrange- ments of the cationic ... monocots, and all gymnosperms regularly form mycorrhizal associa- tions (Wilcox 1991). On the other hand, plants from the families Cruciferae (cabbage), Chenopodiaceae (spinach), and Pro...

Ngày tải lên: 20/02/2014, 01:20

... secondary active-transport proteins. Figure 6.14 illustrates how a membrane H + - ATPase might work. Plant and fungal plasma membrane H + -ATPases and Ca 2+ -ATPases are members of a class known as ... charge across the membrane. There- fore, the H + /K + -ATPase is an electroneutral pump. In the plasma membranes of plants, fungi, and bacteria, as well as in plant tonoplasts...

Ngày tải lên: 20/02/2014, 01:20

... each other. These stacked membranes are known as grana lamellae (singular lamella; each stack is called a granum), and the exposed membranes in which stacking is absent are known as stroma lamellae. Two ... Syne- chocystis (strain PCC 6803) and the higher plant Arabidopsis have been sequenced, and genomes of important crop plants such as rice and maize have been completed (Kotani...

Ngày tải lên: 20/02/2014, 01:20

... oxaloacetate + P i 2. NADP:malate dehydrogenase Oxaloacetate + NADPH + H + → malate + NADP + 3. Aspartate aminotransferase Oxaloacetate + glutamate → aspartate + α-ketoglutarate 4. NAD(P) malic ... Kalanchoe, Sedum); it is found in numer- ous angiosperm families. Cacti and euphorbias are CAM plants, as well as pineapple, vanilla, and agave. The CAM mechanism enables plants to improve wat...

Ngày tải lên: 07/03/2014, 20:20