  Let $p$ be a prime number and $\Bbbk=\bar{\mathbb{F}}_p$, the algebraic
closure of the finite field $\mathbb{F}_p$ of $p$ elements. Let ${\bf G}$ be a
connected reductive group defined over $\mathbb{F}_p$ and ${\bf B}$ be a Borel
subgroup of ${\bf G}$ (not necessarily defined over $\mathbb{F}_p$). We show
that for each (one-dimensional) character $\theta$ of ${\bf B}$ (not
necessarily rational), there is a unique (up to isomorphism) irreducible
$\Bbbk{\bf G}$-module $\mathbb{L}(\theta)$ containing $\theta$ as a $\Bbbk{\bf
B}$-submodule, and moreover, $\mathbb{L}(\theta)$ is isomorphic to a parabolic
induction from a finite-dimensional irreducible $\Bbbk{\bf L}$-module for some
Levi subgroup ${\bf L}$ of ${\bf G}$. Thus, we have classified and constructed
all (abstract) irreducible $\Bbbk{\bf G}$-modules with ${\bf B}$-stable line
(i.e. an one-dimensional $\Bbbk{\bf B}$-submodule). As a byproduct, we give a
new proof of a result of Borel and Tits on the classification of
finite-dimensional irreducible $\Bbbk{\bf G}$-modules.
