scholarly journals The Role of the Distal Elongation Zone in the Response of Maize Roots to Auxin and Gravity

1993 ◽  
Vol 102 (4) ◽  
pp. 1203-1210 ◽  
Author(s):  
H. Ishikawa ◽  
M. L. Evans
Keyword(s):  
Elongation Zone ◽  
Maize Roots ◽  
Distal Elongation Zone

The role of the epidermis and cortex in gravitropic curvature of maize roots

Planta ◽  
1988 ◽  
Vol 176 (4) ◽  
pp. 513-518 ◽  
Author(s):  
Thomas Bj�rkman ◽  
Robert E. Cleland
Keyword(s):  
Maize Roots

Selective infection of maize roots by streptomycin-resistant Azospirillum lipoferum and other bacteria

1979 ◽  
Vol 25 (11) ◽  
pp. 1264-1269 ◽  
Author(s):  
Johanna Döbereiner ◽  
Vera Lucia Divan Baldani
Keyword(s):  
Antibiotic Resistance ◽  
Rhizosphere Soil ◽  
Resistant Bacteria ◽  
Root Infection ◽  
Azospirillum Lipoferum ◽  
Wheat Roots ◽  
Low Level ◽  
Maize Roots ◽  
Resistant Strains

The percentage of low-level streptomycin-resistant (20 μg/mL) bacteria in surface-sterilized or washed maize roots was more than a thousand times higher than that in soil populations. There was also a higher incidence of resistant bacteria in rhizosphere as compared with non-rhizosphere soil and bacteria isolated from maize roots were relatively tolerant to several other antibiotics. Azospirillum lipoferum was predominant in surface-sterilized roots of field-grown maize and was low-level streptomycin-resistant while most soil isolates were sensitive. Inoculation with A. brasilense isolated from wheat roots was unsuccessful in terms of establishment even when streptomycin-resistant strains were used. Unidentified causes of specific plant–bacteria affinities therefore transcend the role of antibiotic resistance in maize root infection.

scholarly journals Heterogeneous phosphate supply influences maize lateral root proliferation by regulating auxin redistribution

2019 ◽  
Vol 125 (1) ◽  
pp. 119-130 ◽  
Author(s):  
Xin Wang ◽  
Jingjing Feng ◽  
Philip J White ◽  
Jianbo Shen ◽  
Lingyun Cheng
Keyword(s):  
Lateral Root ◽  
Lateral Roots ◽  
Root Tip ◽  
Root Proliferation ◽  
Rich Media ◽  
Maize Roots ◽  
Auxin Redistribution ◽  
Naphthylphthalamic Acid ◽  
Auxin Transporter

Abstract Background and Aims Roots take up phosphorus (P) as inorganic phosphate (Pi). Enhanced root proliferation in Pi-rich patches enables plants to capture the unevenly distributed Pi, but the underlying control of root proliferation remains largely unknown. Here, the role of auxin in this response was investigated in maize (Zea mays). Methods A split-root, hydroponics system was employed to investigate root responses to Pi supply, with one (heterogeneous) or both (homogeneous) sides receiving 0 or 500 μm Pi. Key results Maize roots proliferated in Pi-rich media, particularly with heterogeneous Pi supply. The second-order lateral root number was 3-fold greater in roots of plants receiving a heterogeneous Pi supply than in roots of plants with a homogeneous Pi supply. Root proliferation in a heterogeneous Pi supply was inhibited by the auxin transporter inhibitor 1-N-naphthylphthalamic acid (NPA). The proliferation of lateral roots was accompanied by an enhanced auxin response in the apical meristem and vascular tissues at the root tip, as demonstrated in a DR5::RFP marker line. Conclusions It is concluded that the response of maize root morphology to a heterogeneous Pi supply is modulated by local signals of Pi availability and systemic signals of plant P nutritional status, and is mediated by auxin redistribution.

The role of extracellular free-calcium gradients in gravitropic signalling in maize roots

Planta ◽  
1991 ◽  
Vol 185 (3) ◽  
Author(s):  
Thomas Bj�rkman ◽  
RobertE. Cleland
Keyword(s):  
Free Calcium ◽  
Maize Roots

Cytoplasmic calcium levels in protoplasts from the cap and elongation zone of maize roots

PROTOPLASMA ◽  
1991 ◽  
Vol 163 (2-3) ◽  
pp. 181-188 ◽  
Author(s):  
H. Guiragossian Kiss ◽  
M. L. Evans ◽  
J. D. Johnson
Keyword(s):  
Elongation Zone ◽  
Cytoplasmic Calcium ◽  
Maize Roots
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