IP Library › Granted Patent US 12,497,342
Granted Patent B2
US 12,497,342 · App. 18/345,783 · Granted Dec 16, 2025

Methods and compositions for improving plant traits

Inventors: Karsten Temme (Oakland, CA); Alvin Tamsir (San Francisco, CA); Sarah Bloch (Emeryville, CA); Rosemary Clark (Berkeley, CA); Emily Tung (Millbrae, CA)
Assignee: Pivot Bio, Inc.
C05F11/08C05C1/00C05C3/005C05C5/005C05C11/00C07K14/195C12N1/20C12N9/0095C12N9/80C12N9/93C12Y118/06001C12Y305/01002C12Y603/01002
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Quick Facts
Patent No.
US 12,497,342
App. No.
18/345,783
Granted
Dec 16, 2025
Kind
B2
Abstract

Disclosed herein are methods of increasing nitrogen fixation in a non-leguminous plant. The methods can comprise exposing the plant to a plurality of bacteria. Each member of the plurality comprises one or more genetic variations introduced into one or more genes or non-coding polynucleotides of the bacteria's nitrogen fixation or assimilation genetic regulatory network, such that the bacteria are capable of fixing atmospheric nitrogen in the presence of exogenous nitrogen. The bacteria are not intergeneric microorganisms. Additionally, the bacteria, in planta, produce 1% or more of the fixed nitrogen in the plant.

Claims (23)

1 . A method of increasing the amount of atmospheric derived nitrogen in a plant in a field, the method comprising:

exposing the plant in the field to a plurality of engineered diazotrophic bacteria, thereby increasing an amount of atmospheric derived nitrogen within the plant that is exposed to the plurality of engineered diazotrophic bacteria relative to a plant that is exposed to a same amount of a second plurality of a non-engineered diazotrophic bacteria that are the same species as the plurality of engineered diazotrophic bacteria;

wherein the plurality of engineered diazotrophic bacteria comprises at least one genetic variation introduced into a nitrogen fixation genetic regulatory network that results in one or more of: increased expression or activity of NifA or decreased expression or activity of NifL,

wherein at least one genetic variation introduced into the nitrogen fixation genetic regulatory network comprises insertion of a heterologous sequence found within a genome of a bacterium of the genus of the plurality of engineered diazotrophic bacteria; and

wherein nitrogen fixation activity of the plurality of engineered diazotrophic bacteria in non-nitrogen-limiting conditions is greater than nitrogen fixation activity, in similar non-nitrogen-limiting conditions, of a same amount of the second plurality of non-engineered diazotrophic bacteria.

2 . The method of claim 1 , wherein the engineered diazotrophic bacteria further comprise at least one genetic variation introduced into a nitrogen assimilation genetic regulatory network.

3 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria is applied into furrows in which seeds of the plant are planted.

4 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria is coated onto a seed of the plant.

5 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria colonizes at least a root of the plant such that the plurality of engineered diazotrophic bacteria is present in the plant in an amount of at least 10 5 colony forming units per gram fresh weight of tissue.

6 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria, in planta, excretes nitrogen-containing products of nitrogen fixation.

7 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria, in planta, produces at least 1% of fixed nitrogen in the plant.

8 . The method of claim 7 , wherein the fixed nitrogen in the plant produced by the plurality of engineered diazotrophic bacteria is measured by dilution of 15 N in the plants grown in fields treated with fertilizer containing 1.2% 15 N.

9 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria is engineered using at least one type of engineering selected from the group consisting of directed mutagenesis and random mutagenesis.

10 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria is selected from the group consisting of epiphytic diazotrophic bacteria, endophytic diazotrophic bacteria, and rhizospheric diazotrophic bacteria.

11 . The method of claim 1 , wherein the heterologous sequence is a heterologous regulatory sequence.

12 . The method of claim 1 , wherein the plurality of engineered diazotrophic bacteria is intrageneric.

13 . The method of claim 1 , wherein the genetic material of the plurality of engineered diazotrophic bacteria consists essentially of genetic material from bacteria of the same genus of the plurality of engineered diazotrophic bacteria.

14 . The method of claim 1 , wherein the plant is a non-leguminous plant.

15 . The method of claim 1 , wherein the plant is a cereal plant.

16 . The method of claim 1 , wherein the plant is selected from maize, rice, wheat, barley, sorghum, millet, oats, rye triticale, buckwheat, corn, sugar cane, onion, tomato, strawberry, and asparagus.

17 . The method of claim 1 , wherein the plant is selected from pineapple, banana, coconut, lily, grass, peas, alfalfa, tomatillo, melon, chickpea, chicory, clover, kale, lentil, soybean, tobacco, potato, sweet potato, radish, cabbage, rape, apple trees, grape, cotton, sunflower, thale cress, canola, pepper, bean, and lettuce.

18 . The method of claim 1 , wherein the plant a citrus plant.

19 . The method of claim 18 , wherein the citrus plant is selected from an orange plant, a mandarin plant, a kumquat plant, a lemon plant, a lime plant, a grapefruit plant, a tangerine plant, a tangelo plant, a citron plant, and a pomelo plant.

Assignments (2)
SECURITY INTEREST Recorded Dec 22, 2025
From: PIVOT BIO, INC.
To: HSBC BANK USA, N.A.
Reel/Frame 073285/0020 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 20, 2023
From: TEMME, KARSTEN; TAMSIR, ALVIN; BLOCH, SARAH; CLARK, ROSEMARY; TUNG, EMILY
To: PIVOT BIO, INC.
Reel/Frame 066091/0370 →
Continuity (8)
Continuation 17148173 · Jan 13, 2021
Continuation 16685997 · Nov 15, 2019
Division 15954557 · Apr 16, 2018
Continuation 15636595 · Jun 28, 2017
Continuation PCTUS2016042170 · Jul 13, 2016
Provisional Application 62213567 · Sep 2, 2015
Provisional Application 62192009 · Jul 13, 2015
Related Publication 20240010576A1 · Jan 11, 2024
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