absence of photosynthesis, which was further reduced by girdling, presumably because, after girdling, only root system reserves During photosynthetic electron transport, protons are pumped from the stroma into the intrathylakoid space (thylakoid lumen), which become more acid, thereby inducing 0000012485 00000 n
between S. grandis and C. squarrosa in all treatments. 0000006092 00000 n
Although both photosynthetic systems (PSI and PSII) were inhibited under Fe limitation, PSI was affected more severely and earlier than PSII. 0000060879 00000 n
The inhibition of these pathways caused chlorosis and reduced shoot growth. The first enzyme is called RuBP carboxlyase. Sulfur increased significantly growth of the shoot and root of C. squarrosa. 0000015377 00000 n
photosynthesis generated through Mg’s role in photo-synthesis and subsequent sugar movement. 0000061877 00000 n
0000028007 00000 n
The RRS of C. squarrosa was greater significantly in the 100% proportion than that in the 25% proportion of C. squarrosa for all treatments. 0000040819 00000 n
U�-�#B�[�K�����=�b3ǎ������C���2�8t��n�d�TR���sͭ�x���y�~��~��mw�����n�Ѝ�r�j,eHá_�RB�Z���\������b��c9E� Science 02 Jul 1954: Vol. 0000060464 00000 n
In contrast, steady-state stomatal conductance in light was significantly smaller and correlated to a lower accumulation of K in the guard cells. 0000002233 00000 n
0000014401 00000 n
0000002198 00000 n
0000005503 00000 n
0000061494 00000 n
ock productivity. In Experiment 2, new root production at the low CO2 concentration in the light was essentially the same as in darkness, but only 17% of the control value. Dry matter accumulation and allocation were measured after one growing season and CO(2) exchange of whole shoots was measured throughout the growing season. �c�_�i4?�*��-XBsg�\a�Ս�x���y��届+i��:�R1� �!�5$�S�Jbv��q�͆e�OR >�b�4�UG�u-�������K���? Under the treatments of T1 and T2 the shoot growth of S. grandis increased significantly compared with T0 treatment, but there was no significant difference between T1 and T2 treatments, indicating S had no effect on it. Magnesium is required to activate two key enzymes for the efficient functioning of chlorophyll. A further analysis demonstrated that the soluble sugar content was positively correlated with the number of runners. Sulfur also decreased significantly the RRS of C. squarrosa in 100% and 75% proportions of C. squarrosa. 0000033200 00000 n
The decrease in the slope of the A/C(i) curve suggested a decrease in Rubisco activity. Elevated CO(2) increased total biomass by about 20% in both fertilized and unfertilized plants; however, biomass partitioning differed. ]��v7�y\�%=(��a߮�X���Y�����>&d 0000005112 00000 n
Optimising photosynthesis through adequate nutrition will thus support increases in biomass with carry-on positive effects on crop yields. Magnesium is the powerhouse behind photosynthesis in plants. 0000062085 00000 n
Photosynthesis was at least partly reduced by a decline in stomatal conductance. Severe Mg deficiency with pronounced Chl loss was related to almost complete closure of stomata, loss of irradiance response of PN and drastically reduced CO2-fixation rates. Thus light appeared 0000033963 00000 n
0000060143 00000 n
0000061661 00000 n
0000002840 00000 n
Root morphologies of S. grandis was not sensitive to nutrients added. Stomatal responses to darkness, ABA and ambient CO2 remained normal. The decrease was not related to changes in sugar concentration. Therefore, photosynthesis is more allocated to root in infertility soils than in fertility soils and the competition for nutrient resources stimulates root production. H��UMo�6��W(PP��7�ޒ��A���A�iG�-���m�Fq߈J;�M����������ߓ٧[�m����V���m�֓���eU7�;�eF������j&�q�U��6�LIˍ֙,x0:k�d���KDžG0-(�U�ǽ�V��Xͭ�/Nn8���l�Nfe&��z"7N�L�����#��9õ�&[�&��W�~����OU�aXY�[����*�3[\O��?��Fh�#t��G�sHJK���.�S-$��ͥ�~�"l�N;ە�&v�qG,��n�۲�1�Vu�.>�T@�"��
wN����~��l� - ��2���锞�j �R*.��P|Q�眤�\S�N�_������)�����x�h@C�5.�5�3֍��U��������L���=-�L � �v(�,�J����Ǔ�[�L�+�[�ؑd�#��'4%�����ͫ�=>'��O��B����1I� pqގ�v{h�f�H�1�mUǦ�? A defi-ciency of Mg during growth reduces the structural integrity of the middle lamella and the production of energy necessary for defense functions and inactiva-tion of pathogen metabolites… unfertilized + CO(2)-treated plants (-F/+CO(2)). During photosynthesis, the plant takes in carbon dioxide through the leaves and combines it with water from the roots to make … Our results revealed that chlorophyll synthesis and photosynthesis were inhibited, under Fe-deficient conditions. 0000042456 00000 n
Similar stomatal responses were observed for Ca-Mg deficient plants. However, the intra-competition of aboveground of C. squarrosa was significant when nutrients were supplied regardless of sulfur (S) application. 0000011220 00000 n
0000061981 00000 n
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