Question
Which treatment is preferred to develop fertile dihaploid plants generated from pollen culture ?
The correct answer is
Trifluralin treatment
Trifluralin Treatment for Fertile Dihaploid Plants
Pollen culture is a technique used to produce haploid plants from pollen grains. These haploid plants often lack fertility. To obtain fertile dihaploid plants, chromosome doubling of the haploid cells is necessary.
Mechanism of Trifluralin Action
Certain chemical treatments can induce chromosome doubling. Among the options provided, Trifluralin treatment is specifically recognized for its effectiveness in developing fertile dihaploid plants from pollen culture.
- Trifluralin interferes with microtubule assembly, which is crucial for spindle formation during cell division (mitosis).
- By disrupting microtubule dynamics, Trifluralin inhibits proper chromosome segregation.
- This often results in spontaneous chromosome doubling within the cells, leading to the formation of stable, fertile dihaploid plants.
Comparison with Other Treatments
- ABA (Abscisic acid) and NAA (Naphthaleneacetic acid) are plant growth regulators primarily involved in other developmental processes like stress response, growth, and differentiation, not typically used for inducing chromosome doubling in this context.
- DEPC (Diethyl pyrocarbonate) is used for sterilization and enzyme inactivation (like RNase) and has no role in inducing chromosome doubling.
Therefore, Trifluralin treatment is the preferred method for generating fertile dihaploid plants from pollen culture due to its specific action on cell division that promotes chromosome doubling.
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Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
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