The phrase "a primary root" is correct and usable in written English.
It can be used in contexts related to linguistics, botany, or mathematics, where you are discussing the main or fundamental source of something.
Example: "In linguistics, a primary root is the base form of a word from which other words are derived."
Alternatives: "a main root" or "a fundamental root".
Mass unemployment is one of South Africa's greatest ills, and a primary root of the spiralling crime rate.
The two basic types of root systems are a primary root system and an adventitious root system.
The embryo consists of an absorptive foot, a primary root (radicle), and a shoot with whorled appendages.
It's easy – and accurate – to point at education and the removal of music from core curricula as a primary root of the problem.
The latter consists of an absorbing foot; a primary root, or radicle, which promptly penetrates the surface; a prominent first leaf; and a rudimentary, slow-growing stem.
When a primary root encounters a low-P medium, its growth is restrained.
Taproot, Main root of a primary-root system.
The ydk1-D mutant is dominant and has a short hypocotyl, a short primary root, reduced lateral root number, and reduced apical dominance, suggesting that YDK1 may function as a negative component in auxin signaling by regulating auxin activity [ 138].
In the present study, the observed RSA modulations could have contributed to greater tolerance of transient or prolonged drought stress because of increased root branching in the soil upper layers (topsoil foraging) or, to a lesser extent, a longer primary root (deep soil foraging), respectively.
The net result is a narrower RAM and a narrower primary root system compared with WT.
Here we hypothesise that premature entry into mitosis, activated by Spcdc25 expression, restricts the width of these periclinal divisions in both cortex and stele with the net result being a narrower RAM and a narrower primary root system compared with WT.
