Annotations Growth dynamics of oak seedlings (Quercus ...
Annotations Growth dynamics of oak seedlings (Quercus macrocarpa Michx. and Quercus muhlenbergii Engelm.) from gallery forests: implications for forest expansion into grasslands http://link.springer.com.proxy1.lib.uwo.ca/article/10.1007/s004680100103
Some physiological and morphological responses of Quercus macrocarpa seedlings to flooding http://tinyurl.com/jvwjebq
Deepak Sud Bio 2290 Section No. 012 TM Gray 2013 09 24 Annotation #1
Danner B.T., Knapp A.K. (2001) Growth dynamics of oak seedlings (Quercus macrocarpa Michx. and Quercus muhlenbergii Engelm.) from gallery forests: implications for forest expansion into grassland. Tress 15: 271-277 Due to a major decrease in forest fires the gallery forests have been able to expand into the grasslands. The forests have been able to have rapid growth success because of the growth dynamics of bur oak tree (Q. macrocarpa). Drought has typically caused many bur oak trees to die. However due to long-term patterns of precipitation the soil has been moist enough to allow the seedling to grow in the Prairies. In this study it was discovered that the grassland conditions increased the rate of elongation for taproot length in Q. macrocarpa. Before shoot development the taproot ranged in lengths of 14.4 cm to 29.0 cm. However at the end of the sampling period the average length of the taproot for the Q. macrocarpa was 138.8 cm. These conditions also had an effect on shoot elongation rates (SER). During early seedling growth the shoots were elongated very quickly, and then the shoot elongation rate became more consistent. The total biomass for the Q. macrocarpa had also increased for 40% of leaf and stem, 80% for root biomass. The taproot, shoots, and root biomass had so much growth for the Q. macrocarpa because in these conditions water is stressed. Since water is being stressed the Q. macrocarpa has a lot of below ground growth to be able to capture as much water as needed. The leaf and stem had also grown because these conditions provide a lot of sunlight for there expansion. I will cite the effect that the water stressed soil has on the bur oak plant in my article. Annotation #2
Tang Z.C., Kozlowski T.T. (1981) Some physiological and morphological responses of Quercus macrocarpa seedlings to flooding. Natural research council of Canada 12: 196202 In this study the bur oak (Q. macrocarpa) tree seedlings were exposed to flooded environments. The Q. macrocarpa had different physiological and morphological responses to the flooded environment. The Q. macrocarpa is usually an extreme drought tolerant tree, which allows it too deep root. When placed in the flooded soil for 30 days the stomatal frequency and size did not change significantly. However, the flooding did have morphological changes to the stem and root of the Q. macrocarp, it caused hypertrophied lenticels to form above the soil line; more and more formed with increase duration of flooding. Also the roots of the flooded had darkened and many had dead tips. Flooding had also inhibited the seedlings growth, after the 30 experiment the dry weight of the roots of the Q. macrocarpa were more the double in the un-flooded plants. However the leaf water potential of the flooded plants had greatly increased, as well the leaf diffusion resistance had also increased. Flooding also stimulated the release of ethylene by the stems of the Q. macrocarpa plant. In addition flooding resulted in an increase of cellulase activity with plays a role in softening the cell walls. When placed back in a drought environment, the Q. macrocarpa had a decrease in their drought tolerance. Since the plant is extremely drought tolerant and is able to have significant growth in drought environment, the inhibition of growth for the seedlings in flooded environments is accurate.
I will use this article to cite the relationship between flooded soil and the bur oak plant. Total word count: 596
Some physiological and morphological responses of Quercus macrocarpa seedlings to flooding http://tinyurl.com/jvwjebq
Deepak Sud Bio 2290 Section No. 012 TM Gray 2013 09 24 Annotation #1
Danner B.T., Knapp A.K. (2001) Growth dynamics of oak seedlings (Quercus macrocarpa Michx. and Quercus muhlenbergii Engelm.) from gallery forests: implications for forest expansion into grassland. Tress 15: 271-277 Due to a major decrease in forest fires the gallery forests have been able to expand into the grasslands. The forests have been able to have rapid growth success because of the growth dynamics of bur oak tree (Q. macrocarpa). Drought has typically caused many bur oak trees to die. However due to long-term patterns of precipitation the soil has been moist enough to allow the seedling to grow in the Prairies. In this study it was discovered that the grassland conditions increased the rate of elongation for taproot length in Q. macrocarpa. Before shoot development the taproot ranged in lengths of 14.4 cm to 29.0 cm. However at the end of the sampling period the average length of the taproot for the Q. macrocarpa was 138.8 cm. These conditions also had an effect on shoot elongation rates (SER). During early seedling growth the shoots were elongated very quickly, and then the shoot elongation rate became more consistent. The total biomass for the Q. macrocarpa had also increased for 40% of leaf and stem, 80% for root biomass. The taproot, shoots, and root biomass had so much growth for the Q. macrocarpa because in these conditions water is stressed. Since water is being stressed the Q. macrocarpa has a lot of below ground growth to be able to capture as much water as needed. The leaf and stem had also grown because these conditions provide a lot of sunlight for there expansion. I will cite the effect that the water stressed soil has on the bur oak plant in my article. Annotation #2
Tang Z.C., Kozlowski T.T. (1981) Some physiological and morphological responses of Quercus macrocarpa seedlings to flooding. Natural research council of Canada 12: 196202 In this study the bur oak (Q. macrocarpa) tree seedlings were exposed to flooded environments. The Q. macrocarpa had different physiological and morphological responses to the flooded environment. The Q. macrocarpa is usually an extreme drought tolerant tree, which allows it too deep root. When placed in the flooded soil for 30 days the stomatal frequency and size did not change significantly. However, the flooding did have morphological changes to the stem and root of the Q. macrocarp, it caused hypertrophied lenticels to form above the soil line; more and more formed with increase duration of flooding. Also the roots of the flooded had darkened and many had dead tips. Flooding had also inhibited the seedlings growth, after the 30 experiment the dry weight of the roots of the Q. macrocarpa were more the double in the un-flooded plants. However the leaf water potential of the flooded plants had greatly increased, as well the leaf diffusion resistance had also increased. Flooding also stimulated the release of ethylene by the stems of the Q. macrocarpa plant. In addition flooding resulted in an increase of cellulase activity with plays a role in softening the cell walls. When placed back in a drought environment, the Q. macrocarpa had a decrease in their drought tolerance. Since the plant is extremely drought tolerant and is able to have significant growth in drought environment, the inhibition of growth for the seedlings in flooded environments is accurate.
I will use this article to cite the relationship between flooded soil and the bur oak plant. Total word count: 596
