The effect of ethylene on root growth of Zea mays seedlings

The control of primary root growth in Zea mays cv. Merit by ethylene was examined. At applied concentrations of ethylene equal to or greater than 0.1 μL L−1, root elongation during 24 h was inhibited. The half-maximal response occurred at 0.6 μL L−1 and the response saturated at 6 μL L−1. Inhibition of elongation took place within 20 min. However, after ethylene was removed, elongation recovered to control values within 15 min. Root elongation was also inhibited by green light. The inhibition caused by a 24-h exposure to ethylene was restricted to the elongating region just behind the apex, with inhibition of cortical cell elongation being the primary contributor to the effect. Based on use of 2,5-norbornadiene, a gaseous competitive inhibitor of ethylene, it was concluded that endogenous ethylene normally inhibits root elongation.

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EFFECTS OF CA AND SR ON ZEA MAYS SEEDLING PRIMARY ROOT GROWTH

American Journal of Botany ◽

10.1002/j.1537-2197.1969.tb07533.x ◽

1969 ◽

Vol 56 (3) ◽

pp. 271-274 ◽

Cited By ~ 4

Author(s):

Eldon Bonds ◽

Joseph C. O'Kelley

Keyword(s):

Zea Mays ◽

Root Growth ◽

Primary Root ◽

Primary Root Growth

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Primary root growth rate of Zea mays seedlings grown in an alternating magnetic field of different frequencies

Bioelectrochemistry and Bioenergetics ◽

10.1016/s0302-4598(97)00079-2 ◽

1998 ◽

Vol 44 (2) ◽

pp. 271-273 ◽

Cited By ~ 34

Author(s):

Masafumi Muraji ◽

Takuya Asai ◽

Wataru Tatebe

Keyword(s):

Magnetic Field ◽

Growth Rate ◽

Zea Mays ◽

Root Growth ◽

Primary Root ◽

Alternating Magnetic Field ◽

Primary Root Growth ◽

Root Growth Rate

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AtMYB44 Positively Regulates the Enhanced Elongation of Primary Roots Induced by N-3-Oxo-Hexanoyl-Homoserine Lactone in Arabidopsis thaliana

Molecular Plant-Microbe Interactions ◽

10.1094/mpmi-03-16-0063-r ◽

2016 ◽

Vol 29 (10) ◽

pp. 774-785 ◽

Cited By ~ 21

Author(s):

Qian Zhao ◽

Man Li ◽

Zhenhua Jia ◽

Fang Liu ◽

Hong Ma ◽

...

Keyword(s):

Root Growth ◽

Root Elongation ◽

Plant Root ◽

Primary Root ◽

Homoserine Lactone ◽

Defense Responses ◽

Plant Response ◽

Signal Molecules ◽

Cellular Analysis ◽

Primary Root Growth

N-acyl-homoserine lactones (AHL) are the quorum-sensing (QS) signal molecules used by many gram-negative bacteria to coordinate their collective behavior in a population. Recent evidence demonstrates their roles in plant root growth and defense responses. AtMYB44 is a multifaceted transcriptional factor that functions in many physiological processes in plants but whether AtMYB44 modulates the plant response to AHL with aspects of primary root elongation remains unknown. Here, we show that the expression of AtMYB44 was upregulated upon treatment with N-3-oxo-hexanoyl-homoserine lactone (3OC6-HSL). The stimulatory effect of 3OC6-HSL on primary root elongation was abolished in the AtMYB44 functional-deficiency mutant atmby44. In contrast, an enhanced promoting-impact of 3OC6-HSL on primary root growth was observed in AtMYB44-overexpressing plant MYB44OTA. Cellular analysis indicated that the prolonged primary root elicited by 3OC6-HSL is the consequence of increased cell division in the meristem zone and enhanced cell elongation in the elongation zone, and AtMYB44 may act as a positive regulator in this process. Furthermore, we demonstrated that AtMYB44 might participate in the 3OC6-HSL-mediated primary root growth via regulating the expression of cytokinin- and auxin-related genes. The data establish a genetic connection between the regulatory role of AtMYB44 in phytohormones-related gene expression and plant response to the bacterial QS signal.

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Primary Root Elongation of Three Weed Species

Weed Science ◽

10.1017/s0043174500036493 ◽

1974 ◽

Vol 22 (1) ◽

pp. 47-50 ◽

Cited By ~ 17

Author(s):

D. H. Teem ◽

C. S. Hoveland ◽

G. A. Buchanan

Keyword(s):

Root Growth ◽

Gossypium Hirsutum ◽

Root Elongation ◽

Primary Root ◽

Weed Species ◽

Ipomoea Purpurea ◽

Primary Root Growth ◽

Sida Spinosa ◽

Ph Range ◽

Prickly Sida

Primary root elongation of prickly sida (Sida spinosaL.) at pH 5.5 was similar to that at pH 6.5 while sicklepod (Cassia obtusifoliaL.) was reduced to 62% and tall morningglory [Ipomoea purpurea(L.) Roth] to 87% of that at pH 6.5. At pH 5.1, root elongation of prickly sida was reduced to 77% of that at pH 5.5. Some elongation was observed in the pH range of 5.1 to 6.5 for all species. Maximum primary root growth of tall morningglory, sicklepod, and prickly sida occurred at approximately 32° which was similar to that for cotton (Gossypium hirsutumL. ‘Empire’). Temperature as high as 39° did not significantly reduce root elongation of sicklepod. Tall morningglory root growth was reduced approximately 50% by 0.2 ppm of trifluralin (α,α,α-trifluro-2,6-dinitro-N,N-dipropyl-p-toluidine). In contrast, sicklepod and prickly sida root growth was reduced only slightly by 1 ppm of trifluralin.

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