In July 2026, Wang Kejian's team at the Rice Research Institute of the Chinese Academy of Agricultural Sciences successfully identified the endogenous "Huaxu" gene in rice and, building on it, constructed the Fix8 apomixis system with a clonal efficiency exceeding 99%, developing the proof-of-concept variety "Yixi No. 1" (yi-xi, "one-line"). This marks the moment when Yuan Longping's 1986 strategic vision — "from the three-line method to the two-line method, and ultimately to the one-line method" — has finally moved from blueprint to reality, forty years after it was first laid out.
A 40-Year Strategic Roadmap
The three-tier, step-by-step vision Yuan Longping laid out in 1986 looks almost counterintuitive from today's vantage point — at a time when most people were still fighting over the yield figures of a single hybrid-rice plant, he had already drawn the roadmap all the way to its destination.
The three-line method was the earliest to mature as a technical path: a male-sterile line, a maintainer line and a restorer line working as a matched set, capturing heterosis (hybrid vigor) through cross-breeding and seed production. This path, running from 1973 to the present, has fed billions of people in China and across the world. The two-line method is more streamlined: it exploits a photoperiod- and thermo-sensitive sterile line, dispensing with the maintainer line and simplifying the seed-production process, and has been rolled out gradually since 1995. But the two-line and three-line methods share one fundamental flaw that has never been solved — heterosis cannot be fixed.
Hybrid-rice seed has to be re-made from scratch every season. That means farmers must buy new seed every season, and seed companies must re-cross, re-produce and re-run quality control every season. From the gene's point of view, it is as if every time you bake a cake you have to start by growing the wheat — even though you have already found the best recipe, you cannot make the next batch automatically inherit the same quality.
The one-line method offers an answer that is blunt in its directness: let the offspring of hybrid rice copy themselves, genes unchanged.
In 1986 that answer sounded like science fiction — rice reproduces sexually; it has its own program of meiosis and fertilization, and you cannot simply tell it, "From now on, no more offspring — just photocopy yourself." But in 2017 Wang Kejian's team gave the world its first proof: they showed that sexual reproduction could be bypassed, letting hybrid rice produce clonal seed through apomixis.
The paper, published in 2019, was described by Yuan Longping as "a major breakthrough in the field of apomixis research." But he also followed up with a question of his own: when could it be put to use in the field?
From 2017 to 2026 — What Nine Years Crossed
The 2017 breakthrough was a leap "from zero to one" — proof that the path could be walked at all. But between "walkable" and "walkable reliably" lay nine years.
Apomixis has two core difficulties: clonal efficiency and seed-setting rate.
Clonal efficiency determines what fraction of the hybrid seed you plant will grow into a next generation genetically identical to itself. If efficiency is only 50%, then in the field those seeds get mixed with the other half produced through sexual reproduction, and yield and quality swing wildly — the system becomes unusable. By the 97% purity standard for commercialized hybrid-rice seed, clonal efficiency must be held steadily above 97%.
The seed-setting rate is crueller still — it determines whether the clonal seed can itself set enough grain. A variety with excellent clonal efficiency but that sets barely any grain is worthless at the dinner table.
The breakthrough Wang Kejian's team found was an endogenous rice gene they named "Huaxu." The name was chosen with care — in ancient Chinese myth, Huaxu-shi "stepped upon a great footprint and bore Fuxi," conceiving life with no father involved, neatly echoing the non-biparental inheritance of parthenogenesis.
The Huaxu gene is expressed specifically in sperm cells. Ectopically expressing this gene in the egg cell of hybrid rice efficiently induces parthenogenesis, producing haploid offspring. Combined with the MiMe (Mitosis-instead-of-Meiosis) clonal-gamete technology, this constitutes the Fix8 apomixis system.
The Fix8 system performs as follows: across multiple hybrid-rice varieties, under different generations, different planting populations and large field-scale populations, clonal efficiency holds steadily above 99%.
This is not data from one or two varieties, one or two years, or a small experimental plot — it is validation across generations, across varieties and across environments. The upgraded Fix8_Plus2 system built on this foundation gave rise to the proof-of-concept variety "Yixi No. 1," which holds clonal efficiency above 99% while keeping yield on a par with normal levels.
Academician Li Jiayang's assessment directly supplies the historical verdict: "The most fundamental scientific barrier to the one-line method has been cleared. Mr. Yuan Longping's forty-year-old strategic vision for the one-line method has finally moved from blueprint to reality."
What This Breakthrough Means for the Seed Industry
From an industrial perspective, if the one-line method ultimately enters large-scale application, it will fundamentally change the logic of hybrid-rice seed production.
Under the current three-line and two-line methods, seed production is an industrial process that must be repeated every year: maintain the sterile line → cross to produce seed → harvest the F1 seed → sell it to farmers. Every link carries losses: seed-production fields need dedicated isolation zones, manual or mechanical assisted pollination, and strict quality control. If in any given year the climate goes wrong during heading and flowering, both seed yield and quality will fluctuate.
The one-line method is different: once farmers plant "Yixi No. 1," the grain they harvest is itself the seed for the next season. Cross once, and it can be used for generations. No annual seed production, no dedicated seed-production fields, no repeated crossing operations.
This means three things: first, seed-production costs fall substantially; second, the generational consistency of seed quality is fundamentally guaranteed (no longer exposed to year-to-year climate swings in seed production); third, the rollout of hybrid-rice varieties can be far more flexible — in the past, seed-production regions were heavily constrained, but the one-line method lets seed be "multiplied on site."
From an industrial vantage point, this is like having to start by growing the wheat every time you bake a cake — whereas the one-line method amounts to finding a way for the recipe to copy itself. Bake once, use for generations.
Of course, from Fix8's performance in the laboratory and field trials to large-scale commercialization, there is still a stretch of road to travel. But measured by scientific barriers, the longest stretch has already been walked.
A Narrative Style Worth Noting
Guo Jianing's original Weibo post keeps a clear structure within a science report of extremely high information density: strategic background (Yuan Longping's roadmap) → technical journey (the nine-year push from 2017 to 2026) → scientific principle (the Huaxu gene + MiMe + Fix8) → industrial prospects. It uses no superfluous technical jargon to manufacture barriers; every gene name comes with a functional explanation, and every figure (99%, 97%, two years) arrives with context for why it matters.
This is not a simple press release but a piece of science communication that has been fully digested — writing that knows what the reader needs to know and at which point to pause and explain. That quality of writing itself reflects the degree of consensus around this research in the scientific community: the fact that a science-communication blogger can retell it with logic this clean suggests the scientific story itself is clean enough.